A Strategic Framework for Transformational Leadership Development in Megaprojects

: Project managers’ leadership has a direct and an indirect effect on project success. Extant literature has established that transformational leadership style positively affects project success in a major way. The main aim of this research is to understand the variables that positively affects transformational leadership development and their interrelationships in megaprojects. The Total Interpretive Structural Model (TISM) methodology is adopted to propose a framework, and Impact Matrix Cross-Reference Multiplication Applied to a Classiﬁcation (MICMAC) approach is used to examine the strategic nature of the enablers. The research shows that there exists a group of enablers having a high driving power and low dependence, requiring maximum attention and of strategic importance, while another group consists of those variables that have high dependence and are resultant actions. Furthermore, the model explains the relationships among each pair of variables. Organisations dealing in megaprojects would be the major beneﬁciaries of this study. Policy makers in these organisations would explicitly understand the variables and their interrelationships that needs attention for transformational leadership development. This would help them to prioritize their efforts and implement suitable strategies to focus on the most important variables for developing transformational leaders ultimately leading to project success.


Introduction
Megaprojects can be defined as "a transformational project of over US$ 1 billion cost proposed by public or private sectors, providing assets that will last for decades and have large impact on societies" [1,2]. In general, "Megaprojects are characterized as endeavors, which are hard to manage, bring in high amounts of uncertainty, and face difficulties in delivering what they have originally planned to" [3,4]. Megaprojects are unlike normal or regular projects because of the great difference in complexity, strategy, impact and stakeholders [1]. Hence, understanding project success and factors that contribute to project success is quite crucial in the context of megaprojects. Megaprojects have been researched in the Western and American continents, but are under-researched elsewhere, and having more research from other countries to understand management characteristics and practices in the light of megaprojects is very much encouraged [5].
The role of the project manager is important in project management performance. It has been argued that leadership of project managers have great influence on project performance [6,7]. Leadership qualities are one of the crucial determinants in project teams' work and are considered to be the most researched area in organisational studies [8]. Quite often, project management failure happens due to poor leadership skills of the Sustainability 2021, 13, 3480 2 of 21 project manager [9]. The project manager's leadership has a direct and an indirect effect on project success. Leadership has an effect on team building and in turn on project success. Leadership also has a direct effect on project success [10,11]. However, the project manager's role as a key success factor for project success has not been explored properly in the literature [7,12,13].
Megaprojects involve high stakes and have major social, economic, and environmental impacts [14]. Sustainable practices in the different stages are useful approaches to achieving megaproject success [15]. The transformational leadership approach is considered the most suitable style to nurture followers' attitudes [16], which may include inculcating sustainable or green behaviour among the employees. Improving environmental performance is a major objective in megaproject management; however, a key challenge is translating formal project policies into innovative and spontaneous individual initiatives [17]. Megaprojects not only have a significant impact on the natural environment, but also has profound influence on socio-economic issues [18]. Thereby, adopting sustainable delivery processes is one of the most important objectives in megaprojects [19]. Megaproject sustainability requires a focus on balancing economic profitability, social responsibility, and environment protection [20]. Mittal and Dhar [21] argued that green transformational leadership promotes green creative behaviour of employees, leading to improved sustainability in megaprojects.
There are studies that suggest that projects managers need to possess some common set of soft skills and a certain set of skills depending on the type of project [22]. Bass [23] came up with yet another insightful classification of leadership styles to transactional leadership and transformational leadership. In the transactional style, the concern is for the processes, and in the transformational style, there is a concern for the relationships. In transactional leadership, the leader clarifies and formulates the actions and roles of employees so that they can confidently work to reach a specific project objective. When it comes to transformational leadership, which is centred on charismatic leadership, they increase the awareness level of employees, encouraging them to promote higher quality performances and innovativeness, and to develop themselves as better managers. Studies have shown that the transformational leadership style positively affects project success in a major way [10,[24][25][26]. Therefore, the major objectives of this research can be stated as:

•
Understand the interrelationship and hierarchy of the enablers positively affecting transformational leadership development in megaprojects with the help of the total interpretive modelling (TISM) technique; • Analyse the driving and dependent powers of the enablers affecting transformational leadership development (TLD) by using MICMAC analysis; and • Provide the managerial implications of the results that can be adopted in organisations dealing with megaprojects.
The research was conducted in Qatar, which has emerged as one of the most vibrant economies among the Middle Eastern countries and offers an important setting for management researchers to test existing theories. In 2010, the country was awarded the rights to organize the football World Cup 2022, which has accelerated investments in megaprojects like airports, ports, metro, stadiums, expressways, power plants, man-made islands, and new cities, among other things. This study contributes to the existing literature on transformational leadership and project management by proposing a hierarchical model that relates variables of transformational leadership development in the context of megaprojects. The major contribution of the study is in providing an understanding of the interrelationships among the variables and categorisation based on their impact on other variables influencing transformational leadership development in megaprojects. The research outcome would also provide an explanation of the relationships among the variables. This would improve the understanding of the nature of relationship and provide policy makers a chance to develop suitable plans to improve the critical variables.

Literature Review
High level of project complexity and risks are significant obstacles for megaproject success [27]. Transformational leadership is relevant in the project environment as it enables managers to transform their project teams and ultimately affects project performance positively [28]. Transformational leaders can influence their followers using idealized influence, inspirational motivation, intellectual stimulation and individualized consideration [29]. Transformational leadership has been shown to be one of the most effective leadership behaviours in times of change and uncertainty and transformational leaders have also been identified to have a strong, positive influence on subordinates' commitment, which is fundamental to the successful outcome of projects [30]. Transformational leaders play central role in setting project directions, ensuring progress and fulfilment of project goals through organisation-wide cooperation and support [31]. Numerous project challenges demand transformational leadership approaches that drive project management excellence, encourage high-performance teams, and amplify opportunities to project success [32].
Transformational leadership is a concept that has been used in leadership studies since the 1980s, and is said to be the new force in "leadership research" [33]. The relative magnitude of transformational leadership appeared to be quantitatively higher and qualitatively different from the effects specified in other theories collectively referred to as "transactional leadership" [34]. Transformational leaders motivate and inspire their subordinates to perform more than expected [35]. According to path-goal leadership theory [36], when the leadership is transformational in nature, the subordinates get emotionally attached to the leader and will be internally motivated and aroused to follow the leader's behaviour. This results in higher performance of the team and subsequently successful project implementation [37]. Considering the development of transformational leaders as a process, the variables affecting the development are critical for organisations. Therefore, an exhaustive literature review was conducted to derive factors that positively affect the organisations. Finally, after discussion with experts, eleven variables or alternatively enablers of transformational leadership in megaprojects were considered for further analysis in the present research. The eleven enablers are briefly discussed in the following paragraphs.

Procedural Justice Mechanism
Procedural justice is defined as the perception of employees or a leader regarding the fair-mindedness of measures taken to weigh the outcomes they receive for a particular task [38]. It can be visualised as an outcome of leadership behaviour. A review of studies suggests that procedural justice may become a consequence for transformational leadership [39]. According to De Cremer and Tyler [40], there is a positive association between procedural justice and the leadership style. In particular, the transformational type of leadership has been found to be linked with procedural justice. Procedural justice affects people's self-esteem [41] and affects perceptions of employees. Fairness in procedures leads to enhanced contribution of employees [42], thus providing support to the leader. Hence, it can be proposed that procedural justice from the part of organisation and leaders favours transformational leadership behaviour.

Training
Studies in the past have been conducted to examine whether transformational leaders are born or made. However intuitively, training individuals to be more transformational is doable. At the same time, researchers have also opined that transformational leadership behaviour can be dynamically improved [43,44]. The effect of training intervention on leadership behaviour along with outcome has been explored in the past [45]. It has been proposed that transformational leadership training intervention affects task performance as well as overall firm performance through leadership behaviour [46,47]. Using an experimental design, Barling et al. [47] evaluated the impact of transformational leadership training intervention on organisational performance. The work of Kelloway [48] echoed the Sustainability 2021, 13, 3480 4 of 21 above findings and suggested that aspects of transformational leadership can be enhanced using training programs.

Positive Job Attitude
Positive job attitude has been reported as an important determinant of transformational leadership behaviour for two reasons [49]. The first reason is attributed to the fact that job satisfaction motivates employees to take on extra-role tasks and behaviour [50], forming a pivotal part of transformational leadership [51]. Researchers have also suggested that the experience of pleasant feelings at work may be key in determining how transformational leaders will behave [49,52]. Several studies have strengthened the idea that that job attitudes are antecedents to various intended behaviours [50,53], and in consistency with Social Exchange Theory [54], employees may think that due to their positive job attitudes, their jobs give them numerous worthy outcomes and, hence, they develop some motivation to contribute beyond their job assignments. Along similar lines, leaders who are satisfied with their jobs and carry more positive job attitudes may come up with an elevated level of transformational leadership, which is their way of reciprocating. The second reason we posit is the greater degree of consonance (not dissonance) that develops in leaders due to their positive job attitudes. Researchers have opined that job satisfaction provides pathways of pro-social behaviour among leaders, which leads indirectly to transformational leadership [55]. Dissonance leads to absenteeism and turnover; hence, it might not contribute to positive leadership behaviours [56]. In contrast, we posit that leaders that are consonant with their job attitudes may show desirable future transformational leadership, and vice-versa.

Cultural Intelligence
In the current dynamic and multicultural business environment, a leader must appreciate the underlying values associated with varied cultures and then express their needs and motives. In response to such dynamism and the globalisation of firms with rich cultural diversity, researchers have rated cultural intelligence, which may help organisations identify global talent for major projects [57]. This would also enable development of global transformational leaders, i.e., to display transformational leadership behaviours across varied contexts. Earley and Ang [58] explored and defined cultural intelligence (CQ) as the ability of a leader to adapt fruitfully in a cross-cultural work milieu. The concept of cultural intelligence has been recognized as one of the significant predictors of leadership style in international projects [59,60]. For instance, Gurung and Prater [61] stated that organisational leaders find cultural challenges to be hurdles towards foreign operations. Hence, leaders undertaking such endeavours should adopt those leadership approaches that align the drives of a diverse workforce while leveraging organisational objectives [62]. CQ is conceptualised as a set of skills that includes both knowledge and abilities that are supposed to be essential for developing transformational leaders [63]. Elenkov and Manev [64] posited that leaders with high CQ behave more consistently with transformational leadership than those individuals with low CQ. While explaining the role of CQ towards transformational leadership, they argued that such leaders act as role models for expatriate leaders by adapting to different cultures. This ability to swiftly grasp and adapt to these differing meanings accordingly contributes to effective leadership [64].

Goal Orientation
Over the last decade, researchers have shown a great deal of interest in goal orientation [65][66][67]. Goal orientation refers to the goals individuals implicitly pursue while attaining performance outcomes [68]. Dweck [69] originally suggested that the people with goals orientation pursue events and their interpretation. This has led to the identification of learning and performance orientation as components of goal orientation [68,70]. Individuals with learning goal orientation try to understand new things and enhance their competence level for specific tasks. Tabernero and Wood [71] found that learning-oriented individuals develop better self-efficacy and set goals that are more challenging. This behaviour is found to be in line with transformational behaviour of leaders. In addition, it has been envisaged in the past that transactional leaders perform better towards achieving competitive goals [72]. From this viewpoint, it can be assessed that goal orientation is one of the key enablers and motivational functions for transformational leadership.

Handling Uncertain Business Environments
The dynamics and volatility of the external business environment are generally related to the uncertainty of the external environment affecting businesses. When an organisation starts losing business or the environment is turbulent, a change in leading the organisation is pivotal [73,74]. External factors like technological changes and global competition force companies to rethink and delineate the strategies [75]. It has been posited by researchers that uncertainty and volatility in the business environment lead to enhancement of the transformational leadership behaviour [76], and it is the environmental changes that act as enablers towards transformational leadership. To cope with uncertain external environments, transformational leadership emerges to re-align the business. This revolutionary type of transformational leadership helps in developing human capital along with the creation of strategic flexibility [77]. There is a positive association between revolutionary transformational leadership behaviour and environmental circumstances [78]. Thus, the preceding literature offers the basis for proposing a positive effect of business challenges and uncertainty towards transformational leadership behaviour.

Adaptability
According to Bass [23], to transform means the ability to change and embrace the change, and it lies at the heart of transformational leadership. It has been highlighted by many that individuals who possess a desire to change are better able to gauge situations and act accordingly [79,80]. Keller [81] reported that employees that rated high on embracing change tend to recall behaviours pertaining to transformational leadership. Transformational leaders inspect the situation and are inquisitive. Similar characteristics have been found in individuals who were high on openness to experience [80,82]. In addition, they are naturally motivated toward achievement, relish being intellectually stimulated, and are excited by transformational learning [83]. Brummelhuis and Bakker [84] suggested that openness to experience is a key enabler towards transformational learning, providing effective and efficient handling of resources thorough facilitated selection. Similar results were reported by Hildenbrand [85]. Intellectual stimulation has been explored as a component of transformational leadership style [86] and since openness to experience is linked with the merits of innovation acceptance [87], the existence of such characteristics should trigger this trait via intellectual stimulation.

Organisational Structure
According to leadership contingency theory, the effectiveness of leadership behaviour sometimes depends on the various contextual factors of a particular organisation [88,89]. Organisational structure is found to be on equal footing with the contextual factors category and is significant in enabling the acceptance of leadership types [90,91]. Contextual factors depend upon resources and contingencies. Similarly, organisational structure is associated with allocation of resources and its coordination as well [92]. James and Jones [93] defined organisational structure as: "the enduring characteristics of an organization reflected by the distribution of units and positions within the organization and their systematic relationships to each other". The existing literature suggests that a considerable amount of research has been conducted examining the role and consequences of transformational leadership [94,95], but studies focussing on its enablers and antecedents are few and far between. Organisational structure has been reported to be one of the predictors of transformational leadership [96]. Structural characteristics related to transformational leadership may include distribution of authority, formalisation of rules, and downward Sustainability 2021, 13, 3480 6 of 21 communication [97,98]. Similarly, the structure of bureaucratic organisations has been investigated as a significant variable towards transformational leadership [90].

International Experience
In conjunction with cultural intelligence, international experience is also considered to be an antecedent to transformational leadership [99,100]. In multicultural settings, international experience is often defined as an intermediate variable towards leadership outcomes [101]. It has been suggested that the interplay of international experience is required to be considered in order to assess the strength of transformational leadership [63]. Studies in the past have empirically proven the relevance of international experience towards global leadership. It has been suggested that international experience leads to an increase in the managerial competencies required for leadership [102]. International experience has previously been investigated as a variable affecting transformational leadership style [66], and it was found to have a positive influence over transformation style of leadership [103]. Previous studies have also revealed that international experience presents the opportunity to experience a leadership style, thus motivating employees [104].

Communication
One behaviour of transformational leadership is the ability to communicate a desirable, inspirational, and attainable vision. Communication helps transformational leaders in demonstrating inherent attributes like openness in conversation, participation and feedback, and innovation [105]. Communication style has been advocated as an enabler towards transformational leadership behaviour in order to achieve organisational outcomes [106]. Similar results were reported by Berson and Avolio [107], providing a positive link between communication competence and transformational leadership style. They found that leaders who are good communicators have the ability to turn into transformational leaders. According to Barge's communication-centred approach to leadership [108], leadership itself is a form of communication, and is enacted through communication. It can be deduced that transformational leadership depends upon communication competence.
Moreover, an open two-way communication system welcomes feedback and helps a leader in collaborating and nurturing employee satisfaction [105]. In the same vein, [109] claimed that communication competence is correlated with every aspect of transformational leadership (charisma, individual consideration, intellectual stimulation). Communication also helps transformational leaders enable the process of self-persuasion among employees. In this way, transformational leaders foster employees in working towards the core purpose of organisation. Hence, communication style (whether symmetrical or asymmetrical) is the deciding factor in differentiating the communication competence and language of a leader [110].

Future Focus (Focus on Future Outcomes/Consequences)
Transformational leaders identify and articulate a vision by fostering team goals and setting high standards. This is done via consideration of future outcomes or consequences [111]. In the context of leadership, future focus is the level to which leaders consider the future outcomes of their present behaviour. It is the degree to which leaders are influenced by considering the potential success of results. Consideration of future outcomes strengthens transformational leadership behaviour by rating present actions in terms of future consequences [112]. Zhang et al. [113] investigated the effect of future consequences on transformational leadership by examining the relationships between them and found a positive influence of future consequences on transformational style of leadership.

Methodology
The present study adopted a two-stage methodology. The first stage consisted of identification and selection of enablers associated with the TLD in megaprojects. The second stage consisted of understanding the interrelationships of TLD enablers, followed by the model development based on the TISM technique and providing implications to managers involved in megaprojects for developing transformational leaders. The literature review revealed several enablers of transformational leadership development; however, for the present study, the variables were selected on the basis of experts' opinions with respect to their applicability to megaprojects. Next, the TISM technique was applied to develop the interrelationships for the enablers of TLD and to construct their hierarchical model for megaprojects. TISM was preferred over ISM because of the following reasons [114,115]: • ISM interprets only the nodes, whereas TISM interprets both nodes and links in the digraph; • TISM shows some important transitivity links, which can give a better explanatory framework ( Figure 1)  TISM is now a widely acknowledged technique that is applied to different research domains, including healthcare organisations [116], big data analytics [117], higher education institutions [118], additive manufacturing [119], waste management [120], etc., to name a few. Considering the extensive use of the TISM approach in the literature to analyse problems affected by multiple variables, this study has used the TISM technique to develop a hierarchical structural model of TLD enablers implementation in megaprojects. The various steps involved in TISM technique for modelling TLD enablers in megaprojects are presented in the next section.

Data Collection
This study focuses primarily on the performance of megaprojects through the implementation of TLD enablers. The data for this study were collected by organizing personal interviews using an open-ended questionnaire during the period September-December 2020. The prime source of data was the megaprojects organisations operating in Qatar. Qatar is currently a hub for megaprojects, as it is the host of football World Cup 2022. Infrastructure, stadiums and metro are some of the megaprojects underway in Qatar. The organisations that were chosen for our study were based upon researchers' prior experience and personal contacts with people working in these organisations. The experts were from top management, with a working experience in projects of more than 15 years. A face-to-face meeting invitation was mailed to 13 experts, and after a few reminders and requests by telephone, 9 experts finally joined the brainstorming sessions. The details of the experts from whom inputs were solicited are presented in Table 1 The size of the experts group was considered adequate, as per other studies employing TISM.

Identification and Definition of Enablers
Defining and identification of enablers that are significant to the problem or issue is the starting point of the TISM technique [118,119]. Eleven enablers were identified as being related to TLD in megaprojects on the basis of a review of the existing literature and the experts' opinion, as discussed in Section 2.

Establishing Contextual Relationships
The contextual relationships among the TLD enablers of TLD in megaprojects were established by considering the opinions of the industry experts. A brainstorming session using a questionnaire was developed and distributed among the chosen experts (see Section 4.1). The opinions were recorded in the form of 'YES' or 'NO' responses, depending on whether the enabler influences the other enabler. For example, if enabler 1 influences enabler 2, then the contextual relationship is '1'; otherwise, it is '0 .

Interpretive Logic of Pairwise Comparison
An interaction between each combination of enablers is developed via expert assessment in the form of a relationship matrix so that the significant impact of each enabler on other enablers can be obtained. Therefore, for a total of 'n' enablers, the number of comparisons will be n(n − 1) to make an 'interpretive logic knowledge-base'. This interpretive logic knowledge-base matrix, which was derived from the experts' opinions, is shown in Table 2. For example, in Table 2, enabler E2 (Training) directly impacts enabler E6 (Handling uncertain business environment); therefore, the entry in Table 2 for the relationship between these two variables is 'V'. In cases where variables like E4 (Cultural Intelligence) and E10 (Communication) affect each other, the relationship will be 'X', while in cases where there is no relationship, such as between E1 and E2, the relationship will be 'O'.
Future Focus (Focus on Future Outcomes/Consequences) -Relationship Explanation: V: Enabler i will help achieve enabler j; A: Enabler j will help achieve enabler i; X: Enablers i and j will help achieve each other; and O: Enablers i and j are unrelated.

Reachability Matrix and Transitivity Review
The initial reachability matrix was deduced from Table 2 by converting O, A, X entries into binary numbers [121]. The initial reachability matrix was reviewed for the transitivity rule, which implies that if enabler 1 influences enabler 2 and enabler 2 influences enabler 3, Sustainability 2021, 13, 3480 9 of 21 then enabler 1 will influence enabler 3. After reviewing the transitivity rule, the final reachability matrix was obtained, as presented in Table 3.  IV  IV  I  III  I  II  II  V  IV  III  III * indicates transitive link.

Partitioning the Reachability Matrix (Level Partition)
The purpose of level partitioning is to identify the level of each enabler [119], which is necessary for constructing final TISM model. For level partitioning, the final reachability matrix (Table 3) is used and split into different levels. This is carried out by performing a series of iterations for each enabler, leading to the emergence of various levels, as shown in Table 4. An in-depth explanation of the level partition procedure can be found in [121][122][123].

Interpretation of Relationship
This can be considered as the most value-adding step of TISM. In this step, the interpretation of relationship among enablers' is enunciated. This is the additional step in TISM as compared to ISM. In this step, TISM describes how enablers influence each other, a critical step that is not considered in ISM. This makes it easier to understand the relationships and to develop suitable strategies to improve them. This interpretation of the relationships is presented in the interpretive matrix in Table 5.

Creating Total Interpretive Structural Model
The final TISM model was developed with the help of the final reachability matrix and the level partitions [124]. In this model, only significant transitivity and direct links are considered. Enablers having a direct relationship are connected through solid lines, while transitivity links are represented by broken lines. The TISM digraph model is shown in Figure 1. For the TISM model, the causal thinking behind the direct and significant transitive links can be understood from Table 5. When employees perceive that organisation has Procedural Justice Mechanisms in place they will be ready to take new challenges.

E2
-- Training is vital to improve employees' skills, leading to job satisfaction.
Organisations with multicultural workforces need specific training to sensitize them about variety of cultures.
Right type of Training would help to improve goal orientation.
Dynamic business environment requires specific skill sets that would help employees to handle uncertain business environment.

E4
--Cultural Intelligence includes skills that would improve Job Attitude and Satisfaction.
-Cultural Intelligence helps to adapt effectively in cross-cultural work milieu, leading to improvement in employees' ability to understand new things, a critical component of Goal Orientation.
Cultural Intelligence helps to deal with uncertain business environment, as it improves adaptation to new situations quickly.

E5
------  Training helps employees to set team goals and also to evaluate the future outcomes of their present behaviour.

E4
Cultural Intelligence helps employees to appreciate the variety of culture and their values. This improves their openness to experience and adaptability.
--Understanding of diversity of the organisation and cultural values would facilitate communication.
Adapting to a variety of cultures supports future focus, as it helps to evaluate the results in a holistic manner.

E6
Handling Uncertain Business Environment requires employees to be flexible in their approach.

E8
Clear downward communication is a positive element that would affect adaptability.
-Allocation of resources and distribution of authority would create opportunities for many employees to have a chance of working in an international project.

Discussion of the Results (TISM Model)
The basic objective of this study was to identify various enablers of TLD and understand the interrelationships among them that would positively affect the development of transformational leaders in megaprojects. The TISM-based model describes the relationship directions, where the links interpret in what way one enabler leads to another. Table  2 shows the SSIM. It presents the contextual relationship between two enablers, and Table  3 represents the final reachability matrix with '1' and '0' depending upon the symbols V, A, X and O, and also includes the transitive relationship, represented by 1 *. Table 4 represents the level partitioning for the enablers for transformational leadership development. Level I consists of two enablers: 'positive job attitude (E3)' and 'goal orientation (E5)'. These enablers are not influenced by each other and are the outcomes. Positive job attitude is important, as it motivates workers to go beyond their job assignments [54]. In the same vein, employees with goal orientation positively contribute to the organisation, as they try to learn new things, leading to improvements in their competences [68]. This implies that there are two dependent outcomes in the form of goal orientation and positive job attitude when improving TLD enablers in the organisation.
Level-II contains another two enablers: 'handling uncertain business environment (E6)' and 'adaptability (E7)'. Employees who are adaptable can easily understand situations and act accordingly [79], while handling uncertain business situations provides a variety of experiences, leading to improved adaptability [76]. On the other hand, adaptability facilitates innovative learning, which enables effective handling of uncertainty. Furthermore, enabler E6 also influences the first-level enabler 'goal orientation (E5)', meaning that handling the uncertain business environment provides opportunities to understand new things, thereby improving goal orientation. Enabler E7 influences the first-level enabler 'positive job attitude and satisfaction (E3)', meaning that adaptability provides motivation for achievement, leading to positive attitude and satisfaction.

Discussion of the Results (TISM Model)
The basic objective of this study was to identify various enablers of TLD and understand the interrelationships among them that would positively affect the development of transformational leaders in megaprojects. The TISM-based model describes the relationship directions, where the links interpret in what way one enabler leads to another. Table 2 shows the SSIM. It presents the contextual relationship between two enablers, and Table 3 represents the final reachability matrix with '1' and '0' depending upon the symbols V, A, X and O, and also includes the transitive relationship, represented by 1 *. Table 4 represents the level partitioning for the enablers for transformational leadership development. Level I consists of two enablers: 'positive job attitude (E3)' and 'goal orientation (E5)'. These enablers are not influenced by each other and are the outcomes. Positive job attitude is important, as it motivates workers to go beyond their job assignments [54]. In the same vein, employees with goal orientation positively contribute to the organisation, as they try to learn new things, leading to improvements in their competences [68]. This implies that there are two dependent outcomes in the form of goal orientation and positive job attitude when improving TLD enablers in the organisation.
Level-II contains another two enablers: 'handling uncertain business environment (E6)' and 'adaptability (E7)'. Employees who are adaptable can easily understand situations and act accordingly [79], while handling uncertain business situations provides a variety of experiences, leading to improved adaptability [76]. On the other hand, adaptability facilitates innovative learning, which enables effective handling of uncertainty. Furthermore, enabler E6 also influences the first-level enabler 'goal orientation (E5)', meaning that handling the uncertain business environment provides opportunities to understand new things, thereby improving goal orientation. Enabler E7 influences the first-level enabler 'positive job attitude and satisfaction (E3)', meaning that adaptability provides motivation for achievement, leading to positive attitude and satisfaction.
Level-III consists of the enablers 'cultural intelligence (E4)', 'communication (E10)' and 'future focus (focus on future outcomes/consequences) (E11)'. Enabler E4 influences the same-level factors E10 and E11, meaning that understanding of the diversity of organisations and cultural values facilitates communication, as well as the ability to adapt to a variety of cultures [59], thus supporting future focus, as a leader can evaluate the outcomes more easily [64]. Similarly, enabler E10 influences enablers E4 and E11, while enabler E11 influences enablers E4 and E10. This implies that communication among employees provides opportunities to understand people from a variety of cultures, thereby improving their cultural intelligence, and an open two-way communication system supports feedback that would make it easier for employees to evaluate the future outcomes of their present behaviours. Furthermore, enabler E4 affects the second-level enabler 'adaptability (E7)'; this is possible because transformational leaders act as role models [64], thereby helping employees to appreciate a variety of cultures and their values. This improves their openness to experience and adaptability. Enabler E10 alters the second-level enabler 'adaptability (E7)', suggesting that communication supports openness to experience, which is a key enabler of adaptability. Enabler E11 influences the second-level enabler 'handling uncertain business environment (E6)', indicating that future focus helps leaders to consider future outcomes of their present behaviour [112]. This would assist in handling uncertain business environments.
Level-IV consists of another three enablers: 'procedural justice mechanism (E1)', 'training (E2)' and 'international experience (E9)'. Enabler E1 improves the third-level enabler 'future focus (focus on future outcomes/consequences) (E11)', suggesting that leaders will only be able to create team goals and set high standards when procedural justice exists in the organisation, while enabler E2 influences the third-level enabler 'communication (E10)', implying that formal training helps employees understand the merits of effective communication. It also helps employees to understand the channels/mechanisms that facilitate communication among themselves in order to improve organisational outcomes. In addition, enabler E9 affects the enabler 'cultural intelligence (E4)', the third-level enabler indicating that working on international assignments helps employees appreciate the values of various cultures, leading to an improvement in their cultural intelligence. This establishes the role of international experience as an intermediate variable [101], one that is influenced by lower-level variables, and in turn influences variables above it.
Finally, level-V contains only one enabler: 'organisational structure (E8)'. Enabler E8 influences the fourth-level enablers 'procedural justice mechanism (E1)', 'training (E2)' and 'international experience (E9)'. This finding supports the findings of [88,89], which consider organisational structure to be strongly correlated with leadership effectiveness. This implies that organisation structure, which consists of the formalisation of rules, facilitates the procedural justice mechanism, as employees can refer back to rules and understand the decision made in a specific situation, the distribution of authority in an organisational structure, and the mechanisms that provide employees with a chance to work on international projects based solely on merit. Furthermore, enabler E8 also influences the third-and fourth-level enablers 'handling uncertain business environment (E6)' and 'future focus (focus on future outcomes/consequences) (E11)', thereby indicating that organisational structure facilitates the distribution of power and positions within the organisation, supporting the findings of [97,98]. This fosters team goals and leads to the setting of high standards.

MICMAC Analysis
Cross-impact matrix multiplication applied to classification is abbreviated as 'MIC-MAC'. Its purpose is to analyse the driving power and dependence of enablers [122,124]. This is done to locate the critical enablers that drive the whole system under consideration. The final RM was used to build MICMAC grid by summing up all values of '1' in each row of the final RM, representing the driving power of that particular enabler. Similarly, adding all values of '1' in each column in the final RM represents the dependence of that particular enabler. These driving and dependence powers are than plotted in the form of a grid or matrix, as shown in Figure 2. Based on enablers' driving and dependence powers, the enablers in the present study were categorized into four clusters as follows:

1.
Cluster I: contains autonomous enablers. These enablers have weak dependence and weak driving power and are relatively disconnected from the system, with which they have few links, which may be very strong. In the present study, there are no autonomous enablers, implying that the system is stable.

2.
Cluster II: consists of dependent enablers that have weak driving power but strong dependence. In this study, there are four dependent enablers. They are: 'positive job attitude and satisfaction (E3)', 'goal orientation (E5)', 'handling uncertain business environment (E6)' and 'adaptability (E7)', as they exhibit strong dependence but comparatively weak driving power.

3.
Cluster III: includes the linkage enablers, which have both strong driving and dependence powers. These enablers are unstable, as any action on these enablers will have an effect on others, and also a feedback on themselves. In this study, there are three linkage enablers. They are: 'cultural intelligence (E4)', 'communication (E10)' and 'future focus (focus on future outcomes/consequences) (E10)'.

4.
Cluster IV: consists of the independent enablers, which have strong driving power and weak dependence. These enablers drive other enablers and are not affected by other enablers, and are referred as key enablers, but they can significantly improve other enablers. In this study, there are four enablers that fall into this cluster. They are: 'procedural justice mechanism (E1)', 'training (E2)', 'organisational structure (E8)' and 'international experience (E9)'. These enablers plays a key role in the TLD in organisations dealing in megaprojects. Management needs to give high priority to these driving enablers, because changes in these enablers affect the other enablers.
a grid or matrix, as shown in Figure 2. Based on enablers' driving and dependence powers, the enablers in the present study were categorized into four clusters as follows: 1. Cluster I: contains autonomous enablers. These enablers have weak dependence and weak driving power and are relatively disconnected from the system, with which they have few links, which may be very strong. In the present study, there are no autonomous enablers, implying that the system is stable. 2. Cluster II: consists of dependent enablers that have weak driving power but strong dependence. In this study, there are four dependent enablers. They are: 'positive job attitude and satisfaction (E3)', 'goal orientation (E5)', 'handling uncertain business environment (E6)' and 'adaptability (E7)', as they exhibit strong dependence but comparatively weak driving power. 3. Cluster III: includes the linkage enablers, which have both strong driving and dependence powers. These enablers are unstable, as any action on these enablers will have an effect on others, and also a feedback on themselves. In this study, there are three linkage enablers. They are: 'cultural intelligence (E4)', 'communication (E10)' and 'future focus (focus on future outcomes/consequences) (E10)'. 4. Cluster IV: consists of the independent enablers, which have strong driving power and weak dependence. These enablers drive other enablers and are not affected by other enablers, and are referred as key enablers, but they can significantly improve other enablers. In this study, there are four enablers that fall into this cluster. They are: 'procedural justice mechanism (E1)', 'training (E2)', 'organisational structure (E8)' and 'international experience (E9)'. These enablers plays a key role in the TLD in organisations dealing in megaprojects. Management needs to give high priority to these driving enablers, because changes in these enablers affect the other enablers.

Conclusions
The present study helps mangers of megaprojects to identify the key enablers that contribute to TLD in megaprojects. In doing so, the study identified eleven key enablers that positively affect transformational leadership and developed an interrelationship

Conclusions
The present study helps mangers of megaprojects to identify the key enablers that contribute to TLD in megaprojects. In doing so, the study identified eleven key enablers that positively affect transformational leadership and developed an interrelationship model. Enablers influencing the TLD in megaprojects were identified based on a literature review and experts' opinions, and finally a TISM model was developed. Interpretive statements were also derived based on interpretive logic-knowledge. Furthermore, the MICMAC analysis tool was used in this study to classify the identified enablers into four categories, i.e., autonomous, dependence, linkage and independent enablers based on the driving and dependence powers of enablers. The major findings were as follows: • The findings of the study reiterate the fundamental proposition that 'procedural justice mechanism (E1)', 'training (E2)', 'organisational structure (E8)' and 'international experience (E9)' are the significant antecedents of TLD in megaprojects. The qualitative modelling thus validated the significance of these enablers, which were derived from review of the literature and from the viewpoints of industry experts. • TISM results indicated that all enablers of the present study were considered important by the experts and play a role in transformational leadership development in megaprojects. Based on the data collected on the basis of expert opinion and their further interpretation, these enablers were partitioned into five levels.

•
There were four independent enablers in the study, i.e., 'procedural justice mechanism (E1)', 'training (E2)', 'organisational structure (E8)' and 'international experience (E9)', that acted as drivers for the dependent enablers, i.e., 'positive job attitude and satisfaction (E3)', 'goal orientation (E5)', 'handling uncertain business environment (E6)' and 'adaptability (E7)'. These dependent enablers were also influenced by linkage enablers, i.e., 'cultural intelligence (E4)', 'communication (E10)' and 'future focus (focus on future outcomes/consequences) (E10)'. • 'Positive job attitude (E3)' and 'goal orientation (E5)' were found to have the strongest dependence power, clearly justifying these as the outcome for the present TISM model. 'Procedural justice mechanism (E1)', 'training (E2)', 'organisational structure (E8)' and 'international experience (E9)' were found to be the key driving forces for the 'positive job attitude and satisfaction (E3)' and 'goal orientation (E5)' outcomes. • Additionally, 'future focus (focus on future outcomes/consequences) (E11)', 'international experience (E9)', 'handling uncertain business environment (E6)', 'procedural justice mechanism (E1)', 'adaptability (E7)' and 'procedural justice mechanism (E1)', 'cultural intelligence (E4)' held a transitive relation with these enablers, while all other enablers had a direct influence. • Based on the data collected from experts through TISM, a structural hierarchical model of the enablers that influence 'positive job attitude and satisfaction (E3)' and 'goal orientation (E5)' in the megaprojects was developed. Each enabler was compared with all other enablers, and their interaction was defined through knowledge-base logic statements. • MICMAC analysis indicated that four enablers were dependent and four enablers were driving in the system under consideration. The novelty of this study is the development of a hierarchical level among the enablers to show the most influential enablers that drive all other enablers.

Theoretical Contributions of the Study
This study provides a unique model that brings together various elements of transformational leadership development in the context of megaprojects. Although several studies can be found in the existing literature on the importance of transformational leadership, none of the previous studies has attempted to propose a model of variables that opens new vistas of research. A systematic literature review alone cannot serve the purpose of finding the linkages between various factors. Hence, the TISM methodology was applied to interpret and extract the interrelationships among the factors that positively influence transformational leadership development.

Practical Contributions of the Study
Organisations dealing in megaprojects are always looking for leaders that have transformational leadership qualities, as transformational leaders have traits that can influence workers to achieve the goals of the project. However, organisations should focus on in order to inculcate transformational leadership attributes in their prospective leaders is not clear. The present study fills this gap by providing a structural model that advances understanding of the role of the most influential factors affecting transformational leadership development, and their interrelationships and relative significance in megaprojects.
Practising managers in megaprojects organisations will find the model easy to understand. The model would help them to develop suitable strategies and to prioritize their efforts to improve the most significant variables for transformational leadership development, as delineated in the TISM model.

Limitations and Scope for Future Research
A major limitation of this study was the identification of the enablers of transformational leadership development in megaprojects on the basis of a literature review and a survey of experts. The experts considered for this study were working on megaprojects in Qatar, and therefore it is possible that their understanding of relationships may vary in other settings. Thereby, the results of this study can be evaluated in similar settings to validate the TISM model. A good environment for testing the model would be the United Arab Emirates, which has very similar demographic characteristics to Qatar and has several megaprojects underway. Furthermore, in future research, the TISM model can be tested using Partial Least Squares-based Structural Equation Modelling (PLS-SEM). PLS would be a better choice, as it is not easy to find many managers who have experience in megaprojects. In the current TISM model, all the relationships were equally weighted. Future research can also look into the varying the strength of the relationships using the Fuzzy-ISM technique. In addition, future work could also focus on quantifying the relative importance of the critical enablers by using techniques like Graph Theory.  Data Availability Statement: All data used during the study are available from the corresponding author by request.