A Competency Model for the Selection and Performance Improvement of Project Managers in Collaborative Construction Projects: Behavioral Studies in Norway and Finland

: Collaborative work practices are getting more common in construction projects. Consequently, new project delivery models have emerged and new practices have also entered the world of traditional delivery models. The resultant collaborative construction projects provide a different working environment compared to the traditional construction delivery models. This different environment seems to require project managers with certain types of competencies, but there is currently very limited research-based knowledge concerning this subject. This study aims at identifying such competencies, which project managers of collaborative construction projects need to possess to succeed. For this purpose, a human behavioral approach was employed where project managers’ behavior in their everyday work was the main source for understanding their competencies. Accordingly, the survey strategy was utilized, where a self-evaluation questionnaire was sent to 33 project managers of collaborative construction projects, and a response rate of 73% was achieved. The ﬁndings present four groups of competencies within a matrix model, structured based on their contribution to project managers’ successful performance in collaborative construction projects and the degree to which they can develop those competencies. The developed model can provide a baseline for selecting project managers and for enhancing the performance of the current ones.


Introduction
Delivery models of construction projects are subjects of continuous development and changes. Some of them reflect past practices and traditions, but it is possible to recognize developments that can present valuable drivers for improving the performance of construction projects. An example of such developments is shifting from traditional delivery models of construction projects (e.g., design-bid-build, design-build) toward relational contracting/lean project deliveries (also called collaborative project delivery models) [1,2].
In a holistic view, collaborative delivery models of construction projects comprise alliancing, partnering, integrated project delivery (IPD), relational contracting and relationship-based procurement [3,4]. These collaborative delivery models of construction projects are usually characterized by fixed profit, guaranteed variable cost without a cap, profit based on project outcome and limited change orders [5,6]. Moreover, these collaborative delivery models have some key elements such as early involvement of the It looks obvious that project managers' behavior in their everyday work has been one of the important sources for understanding their competencies [2,15,30,65]. This viewpoint is selected in this study as well to address the subject of interest.

The View of Standards of Practice on Project Managers' Competencies
Four standards of practice have been identified as the sources addressing project managers' competencies. ICB.4(Individual Competence Baseline) explains the competency as the utilization of abilities, skills and knowledge for achieving the desired results, and presents project managers' 28 competencies in three groups of people, practice and perspective [66]. The PMCD (Project Manager Competency Development) framework introduces 16 competencies that are categorized in two groups, performance and personal competencies [67]. The APM (Association for Project Management) Body of Knowledge classifies project managers' 11 competencies in interpersonal and professional groups [68]. A framework, entitled PMI Talent Triangle, was introduced in the PMBOK (Project Management Body of Knowledge) Guide, in which three types of project managers' skills are presented [69] (see Table 1 for details). It looks obvious that project managers' behavior in their everyday work has been one of the important sources for understanding their competencies [2,15,30,65]. This viewpoint is selected in this study as well to address the subject of interest.

The View of Standards of Practice on Project Managers' Competencies
Four standards of practice have been identified as the sources addressing project managers' competencies. ICB.4(Individual Competence Baseline) explains the competency as the utilization of abilities, skills and knowledge for achieving the desired results, and presents project managers' 28 competencies in three groups of people, practice and perspective [66]. The PMCD (Project Manager Competency Development) framework introduces 16 competencies that are categorized in two groups, performance and personal competencies [67]. The APM (Association for Project Management) Body of Knowledge classifies project managers' 11 competencies in interpersonal and professional groups [68]. A framework, entitled PMI Talent Triangle, was introduced in the PMBOK (Project Management Body of Knowledge) Guide, in which three types of project managers' skills are presented [69] (see Table 1 for details).

. Research Design
The research is undertaken to identify the competencies of project managers in the context of collaborative construction projects. Consequently, the research purpose here is descriptive, as it aims to portray the relevant competency profile. An important principle for the competency evaluation is the fit of competencies to the required characteristics and the job [15,30]. As explained earlier, the behavioral approach has been common for the competency studies, where frequency and type of individuals' (here the project managers') behavior in their everyday work is the main source for understanding their competencies. Thus, the self-evaluation of project managers' behavior is an efficient method of a competency study, because it is seen that a competency is a behavioral capability, and thus the project manager is the best evaluator of his/her behavior in the everyday work [65,70]. Accordingly, the survey strategy was employed to fulfill the intended purpose of this study, the approach of which is deductive, as there is a wealth of literature on project managers' competencies. According to Saunders et al. [71], "the survey strategy is popular and common in business and management research and is mainly utilized to answer who, what, where, how much and how many questions". Therefore, it is usually employed for conducting exploratory and descriptive studies. The popularity of surveys is mainly due to the possibility which they provide for collecting data in shorter periods of time and in a cost-effective manner [71].

The Utilized Survey Technique
The behavioral approach in competence research has acted as a starting point for the development of research techniques. Reviewing the literature on project managers' competencies in this study also led to the identification of a self-evaluation questionnaire. In this survey tool "Cycloid", by Evolute Technology (www.evolute.fi), the focus is on evaluating project managers' key behavioral competencies based on their current state (reality), target state (vision), and creative tension, which is the gap between personal vision and current reality [65,72,73]. If the reality and the vision are the same and there is no gap between them, there will be no motivation because of the lack of perceived need to move toward the vision. Accordingly, project managers' 30 behavioral competencies are evaluated through 60 linguistic statements (Appendix B), two statement per competency. This was performed by asking the respondents to select and determine the frequency of their behaviors in the situations presented by each linguistic statement on a scale of always/often/seldom/never in their current and target state. Evaluation of the frequency of these behaviors occurring in the representative statements of each competency was carried out both in the current and target states through analyzing the numeric values of the current and target states of the self-evaluation results.

Theoretical Origin of the Competencies and Their Representing Statements in Cycloid
These competencies and their representing linguistic statements originate from the research by Kirsi Liikamaa [74]. Later, these competencies have been categorized into two main groups and five subgroups [65] (Table 2).

Group Subgroup Competency
Personal Competencies

Self-awareness
Emotional awareness, Self-assessment, Self-confidence  [65] undertook this categorization according to Goleman's [75] ontology of the five components of emotional intelligence at work, containing social competencies (social awareness and relationship management) and personal competencies (self-awareness, self-management and motivation). Several studies have employed Cycloid for evaluating project manager's competencies in various contexts [2,65,72,76,77]. Moreover, the competencies in Cycloid (listed in Table 2) were compared with identified competencies from the literature study (Figure 1 and Appendix A), and it became clear that the competencies in the Cycloid questionnaire are in line with the previous research on construction project managers' competencies.

Motivations for Choosing Cycloid
Cycloid was selected for data collection in this study for six reasons. First, it has considerable theoretical support, and its content (30 behavioral competencies) is in line with the previous research on the competency subject in the context of construction projects. Second, it has a record for being utilized in numerous competency studies since 2006. Third, it provides the possibility of using the behavioral approach for the competency study in a reliable and highly economical way. Fourth, it was available in several languages (e.g., English, Finnish, Norwegian), thus making possible the collection of data from the respondents in their mother tongue. Fifth, its structure makes it possible to carefully evaluate the significance and frequency of project managers' different behaviors in their everyday job, representing their competencies, in the current state (reality) and target state (vision). Sixth, it can reveal the gap between the current and target state of the project managers' different behaviors, which in turn can be a useful source of information for the performance improvement.

Data Collection
The collection of data was undertaken through non-probability volunteer sampling. The sampling choice was based on three reasons: (i) there was no sampling frame available concerning the targeted population, (ii) there was no need for statistical inference from the sample, and (iii) data could be collected from the entire target population [71]. Accordingly, the questionnaire was sent to 33 project managers of recently completed or ongoing alliance and/or partnering construction projects in Finland and Norway. Finland and Norway were chosen for data collection because of their representativeness in terms of collaborative construction projects [2,78].
The categories of the studied construction projects comprise infrastructure (road and railway), institutional (hospital and school) and residential building (housing construction). In total, 24 questionnaires were completed (February-April 2020) and a response rate of 73% was achieved. Among respondents, 35% of them are/were working as the client's project manager and 65% of them as the contractor's project manager. Figure 2 presents the survey respondents' demographic information.

Data Collection
The collection of data was undertaken through non-probability volunteer sampling. The sampling choice was based on three reasons: (i) there was no sampling frame available concerning the targeted population, (ii) there was no need for statistical inference from the sample, and (iii) data could be collected from the entire target population [71]. Accordingly, the questionnaire was sent to 33 project managers of recently completed or ongoing alliance and/or partnering construction projects in Finland and Norway. Finland and Norway were chosen for data collection because of their representativeness in terms of collaborative construction projects [2,78].
The categories of the studied construction projects comprise infrastructure (road and railway), institutional (hospital and school) and residential building (housing construction). In total, 24 questionnaires were completed (February-April 2020) and a response rate of 73% was achieved. Among respondents, 35% of them are/were working as the client's project manager and 65% of them as the contractor's project manager. Figure 2 presents the survey respondents' demographic information.

Development of the Matrix Model of Competencies for Project Managers of Collaborative Construction Projects
The research data portray the current state, the target state, and the creative tension of project managers' competencies in the context of collaborative construction projects. The analysis of these data formed a basis for the matrix model of competencies which answers the research question in this paper. The development of the matrix model was undertaken in three steps, and was based on two important aspects of competencies which were mentioned earlier: (i) contribution to successful performance, and (ii) difficulty of improvement. The following Figure 3 shows the process of developing the matrix model which is followed by an explanation of the process.

Development of the Matrix Model of Competencies for Project Managers of Collaborative Construction Projects
The research data portray the current state, the target state, and the creative tension of project managers' competencies in the context of collaborative construction projects. The analysis of these data formed a basis for the matrix model of competencies which answers the research question in this paper. The development of the matrix model was undertaken in three steps, and was based on two important aspects of competencies which were mentioned earlier: (i) contribution to successful performance, and (ii) difficulty of improvement. The following Figure 3 shows the process of developing the matrix model which is followed by an explanation of the process.
The analysis of these data formed a basis for the matrix model of competencies which answers the research question in this paper. The development of the matrix model was undertaken in three steps, and was based on two important aspects of competencies which were mentioned earlier: (i) contribution to successful performance, and (ii) difficulty of improvement. The following Figure 3 shows the process of developing the matrix model which is followed by an explanation of the process. The first step was obtaining the competency research data (the significance of project managers' different competencies in the current state, target state and creative tension) through the conducted surveys in Norway and Finland, which were explained earlier. In the second step, the competencies were structured based on their contribution to project managers' successful performance. These structured competencies were those top 10 ones  The first step was obtaining the competency research data (the significance of project managers' different competencies in the current state, target state and creative tension) through the conducted surveys in Norway and Finland, which were explained earlier. In the second step, the competencies were structured based on their contribution to project managers' successful performance. These structured competencies were those top 10 ones (in terms of the significance) in the target state, current state and creative tension of the respondent groups. The top 10 competencies in the target state and creative tension as well as current state are seen as the most important ones among the total 30 competencies for contributing toward the successful performance of the project managers. This structuring was performed through developing a three points scale (1-3), where: • those competencies "common" in the "target state" of the "both respondent groups" were qualified as the highest (3); • those competencies "common" in the "current state and creative tension" of the "both respondent groups" were qualified as the medium (2); • those competencies "specific" in the "target state and/or creative tension" of "each respondent group" were qualified as the lowest (1). (See Table 3) Table 3. Numeric values of the competencies based on their contribution to successful performance and difficulty of improvement. This developed scale represents the extent to which competencies contribute to the successful performance of the project managers. Therefore, it was entitled as CSP (contribution on successful performance). Table 3 presents the CSP values assigned to each competency.

Competency
The reason why common target state competencies were outweighed was that these competencies, as can be understood from the title, are the visionary and the most appropriate ones for project managers of collaborative construction projects. Moreover, the high overlap between the target state competencies of both the respondent groups was the second reason for the prioritization.
In the third step, the competencies were structured based on the degree to which project managers have difficulty in improving them. It was carried out by determining the difficulty of improvement of those competencies (structured in the first step) with high, medium and low contribution to successful performance of the project managers. A three-point scale (1-3) was then developed, where: • the "most difficult to improve" competencies were qualified as "the highest point (3)"; • "somewhat difficult to improve" competencies were qualified as "the medium point (2)"; • "easy to improve" competencies were qualified as "the lowest point (1)".
This developed scale represents the extent to which project managers can improve their competencies. Therefore, it was entitled DAI (difficulty of improvement). Table 3 presents the DAI values assigned to each competency. This structuring of competencies was undertaken based on the relevant classifications made by Zwell [15] and Spencer and Spencer [30], whereby competencies related to skill and knowledge are relatively easy to develop, competencies related to motive and trait are hard to develop, and finally the competencies related to self-concept lie somewhere between and are somewhat hard to develop.
In the fourth step, the 3 × 3 matrix was developed based on the structuring of competencies in the previous steps. This was conducted by creating a table (see Table 3) and multiplying the CSP and DAI values of each competency and placing the competencies within the matrix accordingly. The definitions and behavioral indicators of the listed competencies in the model can be found in Appendix B.

Limitations and Reliability of the Utilized Survey Technique
Generally, "self-evaluation can be seen as an efficient and effective way for managing personal growth, developing oneself, clarifying roles, and committing to project-related tasks", [70,72]. However, there is a concern regarding this type of evaluation. It is less reliable for evaluating work performance [79], as people prefer to evaluate their own performance as the better one compared to others [80]. According to Refs. [72,81], "the effectiveness of self-evaluation can be better in evaluating the relationship between different items, such as competencies, than in comparing individuals' performance with each other".
Torrington and Hall [81] stated that "the effectiveness of this method depends on the content of the evaluation, the application method, and the organizational culture". In the selected approach for this study, the significance of different competencies in the current state and the target state were evaluated through statements related to the individual's everyday work. Individuals thus directly evaluated their own behavior instead of their own performance. Additionally, the futuristic viewpoint includes the concept of creative tension [73]. For this purpose, the self-evaluation presents an efficient way to reveal individuals' intentions and aspirations [72].

Results
The findings are presented in four groups. The first group presents the significance of project managers' various competencies in their current state. This is followed by presenting the 10 highest significant target state and creative tension competencies. Finally, Group 4 presents the matrix model of competencies for project managers of collaborative construction projects. Table 4 presents Finnish and Norwegian project managers' highest significant competencies (top 10) in their current state. Here, with Finnish project managers', trustworthiness was discovered as the highest significant competency, with the statements focusing on acting honestly and in an ethical manner, and admitting mistakes. The second highest ranked competency was responsibility, with the statements evaluating the ability of being responsible for the progress of one's own work and responsibility for common goals. The third highest one was achievement orientation, representing the ability of driving toward a high standard of excellence, and setting challenging goals and working hard to achieve them. The fourth highest one was stress tolerance, with the statements evaluating the capability to maintain performance when facing workload pressures and/or organizational impediments. The fifth highest one was leveraging diversity, with the statements focusing on the appreciative attitude towards others and respecting people from different backgrounds. Figure 4 presents different current state competencies of Finnish project managers in terms of the significance.

Group 1: The Current State of Project Managers' Different Competencies
Regarding Norwegian project managers, it looks obvious that 70% of their highest significant competencies in the current state are the same as their Finnish colleagues (Table 4). This can be also a clue to the reliability and validity of this study. Another interesting point here is that trustworthiness competency has been discovered as the most significant in the current state of the both respondent groups, as trust-based relationships and cooperation in collaborative construction projects are crucial.
There are also some differences between the current state competencies of the two respondent groups. Collaboration, self-assessment and analytical thinking are three competencies in the current state of Norwegian project managers which are not present among the most significant competencies of Finnish project managers (Table 4). Concerning Finnish project managers, responsibility, achievement orientation and leveraging diversity are those highest-significant competencies which are not common with the current state competencies of Norwegian project managers. Figure 5 presents different current state competencies of Norwegian project managers in terms of their significance. ment orientation, representing the ability of driving toward a high standard of excellence, and setting challenging goals and working hard to achieve them. The fourth highest one was stress tolerance, with the statements evaluating the capability to maintain performance when facing workload pressures and/or organizational impediments. The fifth highest one was leveraging diversity, with the statements focusing on the appreciative attitude towards others and respecting people from different backgrounds. Figure 4 presents different current state competencies of Finnish project managers in terms of the significance. Regarding Norwegian project managers, it looks obvious that 70% of their highest significant competencies in the current state are the same as their Finnish colleagues ( Table 4). This can be also a clue to the reliability and validity of this study. Another interesting point here is that trustworthiness competency has been discovered as the most significant in the current state of the both respondent groups, as trust-based relationships and cooperation in collaborative construction projects are crucial.
There are also some differences between the current state competencies of the two respondent groups. Collaboration, self-assessment and analytical thinking are three competencies in the current state of Norwegian project managers which are not present among  (Table 4). Concerning Finnish project managers, responsibility, achievement orientation and leveraging diversity are those highest-significant competencies which are not common with the current state competencies of Norwegian project managers. Figure 5 presents different current state competencies of Norwegian project managers in terms of their significance.

Group 2: The Target State of Project Managers' Different Competencies
The following Table 5 presents the top 10 target state competencies (in terms of significance) of Finnish project managers for collaborative construction projects.

Group 2: The Target State of Project Managers' Different Competencies
The following Table 5 presents the top 10 target state competencies (in terms of significance) of Finnish project managers for collaborative construction projects. Initiative 9 Optimism 10 Self-assessment 10 Group capabilities There is 90% overlap for the five most significant competencies in the current and target states of Finnish project managers (see Tables 4 and 5). Group capabilities competency is the one which is not present among their top five current state competencies. This overlap suggests that the current competency profile of Finnish project managers in the addressed context is close to the ideal one in their target state. Figure 6 presents different target state competencies of Finnish project managers in terms of their significance. There is 90% overlap for the five most significant competencies in the current and target states of Finnish project managers (see Tables 4 and 5). Group capabilities competency is the one which is not present among their top five current state competencies. This overlap suggests that the current competency profile of Finnish project managers in the addressed context is close to the ideal one in their target state. Figure 6 presents different target state competencies of Finnish project managers in terms of their significance. Regarding Norwegian project managers, there is a high match (80%) between their 10 most significant competencies in the current and target states (see Tables 4 and 5). Conflict management and decision quality are two competencies in their target state which are not present in the current state. Conflict management competency is related to project Regarding Norwegian project managers, there is a high match (80%) between their 10 most significant competencies in the current and target states (see Tables 4 and 5). Conflict management and decision quality are two competencies in their target state which are not present in the current state. Conflict management competency is related to project managers' capability to negotiate and resolve disagreements between people and to reach out for win-win situations. The statements representing decision quality competency evaluate project managers' ability to make decisions according to principles, purposes, and values. The mentioned overlap between Norwegian project managers' current and target state competencies indicates a considerable match between their current and the ideal (target) competency profile.
There is also a considerable match (70%) between the 10 most significant competencies of Finnish and Norwegian project managers in their target state (Table 5). This identified overlap can be seen as an indication of the match between the obtained results from two different contexts, addressed in this study. This match, in turn, can provide a basis for developing a synthesis of the findings. Figure 7 presents different target state competencies of Norwegian project managers in terms of their significance.

Group 3: The Creative Tension regarding Project Managers' Competencies
Group 3 presents the competencies in which the greatest gap between the current state and the target state (creative tension) was identified (see Table 6). The mentioned gap shows the respondents' interest in improving their competencies.

Group 3: The Creative Tension regarding Project Managers' Competencies
Group 3 presents the competencies in which the greatest gap between the current state and the target state (creative tension) was identified (see Table 6). The mentioned gap shows the respondents' interest in improving their competencies. Organizational savvy 9 Seeking information 10 Understanding others 10 Achievement orientation Finnish project managers are most interested in developing their relationship building (see Table 6). This competency was the second least significant in their current state and is related to project managers' ability to build and maintain friendly relationships with those contacts which are or might be useful for realizing work-related goals. This amount of creative tension toward this competency is understandable, as trust-based relationships are one of the main success factors for collaborative construction projects. The second competency of interest here is production efficiency, wherein the statements concentrated on the ability of performing tasks quickly and according to high standards. This competency was evaluated as the third least significant in the current state (see Figure  4). The third highest creative tension was identified for the competency of decision quality. This is followed by the management competency (see Figure 8), which also was among the 10 least significant competencies in the current state. competency of interest here is production efficiency, wherein the statements concentrated on the ability of performing tasks quickly and according to high standards. This competency was evaluated as the third least significant in the current state (see Figure 4). The third highest creative tension was identified for the competency of decision quality. This is followed by the management competency (see Figure 8), which also was among the 10 least significant competencies in the current state. It is worth mentioning that the common competencies in the current state and in the target state of Finnish project managers are not present among their top 10 creative tension competencies. This can be a message that they need complementary competencies (those highly significant ones in their creative tension), in addition to the target state ones, to support their successful performance.
Norwegian project managers, like their Finnish colleagues, have the most willingness to improve and develop further their production efficiency competency (see Table 6). It is worth mentioning that the common competencies in the current state and in the target state of Finnish project managers are not present among their top 10 creative tension competencies. This can be a message that they need complementary competencies (those highly significant ones in their creative tension), in addition to the target state ones, to support their successful performance.
Norwegian project managers, like their Finnish colleagues, have the most willingness to improve and develop further their production efficiency competency (see Table 6). Communication competency was evaluated as the second highest here, which points to the ability to listen to others, to openly express one's feelings, ideas and opinions, and to read non-verbal cues. Understanding others' competency was the third highest in this category, with the statements focusing on project managers' capability to notice other individuals' feelings and perspectives. Stress tolerance is the next competency, which was also among the 10 highest ones in their current state. This can be a clue that Norwegian project managers of collaborative construction projects deal with considerable amounts of stress in their everyday work. The fifth competency which Norwegian project managers have high amounts of willingness to improve was conflict management (see Table 6 and Figure 9).  Table 7 presents the differences, labeled "unique," and similarities, labeled "same for all," between the creative tension competencies of the two respondent groups (see Table  6) for improving their competencies.   Table 7 presents the differences, labeled "unique", and similarities, labeled "same for all", between the creative tension competencies of the two respondent groups (see Table 6) for improving their competencies.
Unlike the current state and target state, there are several differences between the viewpoints of the two respondent groups. The ranking of the competencies listed in Table 7 was developed based on the median of the ranking in the creative tension of the two respondent groups (Table 6). Those competencies with the same rank in both respondent groups have been listed alphabetically.

Group 4: Matrix Model of Competencies
This matrix model presents project managers' competencies for collaborative construction projects. The model was developed for classifying and grouping competencies according to their nature, i.e., characteristics of importance.
For this purpose, competencies were structured based on the following: Contribution to project managers' successful performance (vertical axis), and the Degree of difficulty to improve those competencies (horizontal axis) (see Table 3 for details). This structuring, as can be seen in Figure 10, resulted in discovering key competencies, supportive competencies, hybrid competencies and threshold competencies based on which the matrix was divided into four sets.
Among the key competencies, trustworthiness, stress management, initiative and optimism were common in the target state of both the respondent groups. This means that these competencies considerably contribute toward the successful performance of the project managers. In addition, these four competencies are hard to improve, as they are more hidden and central to personality. The last competency in this group is flexibility, which was common in the current state competencies of Finnish and Norwegian respondents. This competency is also hard to improve, but its contribution to successful performance is lesser than the four ones described earlier.
The key competencies, altogether, are hard to improve while contributing to the successful performance of the project managers. Therefore, the most cost-effective way for the employers is to select those project managers for collaborative construction projects that already have these competencies. The definition and behavioral indicators of the presented competencies within the model in Figure 10 can be found in Appendix B.
The supportive competencies are easier to develop, as they are knowledge and skilloriented. In terms of contribution to successful performance, the relevance of group capabilities competency is higher than others in this group. Training is the best means of improving the supportive competencies, which can be considered for improving the performance of the existing project managers. according to their nature, i.e., characteristics of importance.
For this purpose, competencies were structured based on the following: Contribution to project managers' successful performance (vertical axis), and the Degree of difficulty to improve those competencies (horizontal axis) (see Table 3 for details). This structuring, as can be seen in Figure 10, resulted in discovering key competencies, supportive competencies, hybrid competencies and threshold competencies based on which the matrix was divided into four sets. Among the key competencies, trustworthiness, stress management, initiative and optimism were common in the target state of both the respondent groups. This means that these competencies considerably contribute toward the successful performance of the project managers. In addition, these four competencies are hard to improve, as they are more hidden and central to personality. The last competency in this group is flexibility, which was common in the current state competencies of Finnish and Norwegian respondents.

Competency Model for Project Managers of Collaborative Construction Projects
High -Group Capabilities -Conflict management -Self-assessment

Key Competencies
Those competencies to be considered by employers for selecting the project managers, as they are hidden and central to personality and considerably contribute toward the successful performance of project managers.

Supportive Competencies
Those competencies to be considered by project managers for performance improvement, as they can be improved easier by training and also contribute toward the successful performance of project managers.

Hybrid Competencies
Those competencies to be considered by both project managers and their employers. These competencies considerably contribute to successful performance, and it is neither too difficult nor too easy to improve them.

Threshold competencies
Those competencies needed for minimally accepted level of work, the lower cut off point below which a project manager of a collaborative construction project would not be considered competent. The hybrid competencies are somewhat difficult to improve, but they also significantly contribute toward the successful performance of project managers. Accordingly, these competencies, with dual functionality, can be considered for both the selection of project managers of relevance and for improving the performance of the existing ones.

Difficulty of Improvement
Finally, the threshold competencies are those ones which seem to make less contribution to successful performance (compared to the previously explained groups). These competencies are required for the minimally accepted level of work, the lower cut off point below which a project manager of a collaborative construction project would not be considered competent.

Discussion
The first and second groups of results showed considerable matches between the current state competencies of both the respondent groups as well as their target state competencies (Tables 4 and 5). Project managers of collaborative construction projects, as the leaders, need to establish cooperation between project team members based on trust-based relationships for the good of the project [2,5]. Such an achievement by the project manager requires competencies such as trustworthiness, stress management, conflict management, and groups capabilities, as have been identified in this study. Moreover, the manager of a project with a single co-located team, jointly developing and validating goals and controlling the project, needs to know his or her strengthens and weaknesses (selfassessment competency) to effectively contribute toward project development and control. Additionally, such a project manager should be able to see the different opportunities and seize them (initiative competency) for the good of the project. Finally, the project manager needs to be determined to achieve the goals of the project regardless of the setbacks and/or organizational impediments (optimism competency).
The third group of results presented the creative tension competencies of the project managers, wherein there were some similarities between the viewpoints of the two respondent groups. Both Finnish and Norwegian project managers prefer to improve their production efficiency, understanding of others, and decision quality competencies. Throughout every collaborative construction project, in the design and construction processes, there are a series of internal suppliers and customers [6]. "These relationships are often implicit rather than explicit, and there is a very long chain of events starting with planning and design, where information is built on information, while in construction, material is built upon material", [6]. The project manager of such a collaborative environment needs to perform his or her tasks quickly and according to high standards (production efficiency competency) and make reliable decisions based on principles, purpose and values (decision quality competency) in order to be a successful supplier for his/her customers (team members). Such a project manager also needs to sense the feelings and perspectives of other people (understanding others' competency) to be able to build and maintain effective relationships with his/her team members.
Unlike the target state competencies, there are several differences between the creative tension competencies of the two respondent groups, which are understandable, as some features of collaborative construction projects are unique and context-oriented, e.g., culture, contracting parties. For instance, leveraging diversity and language proficiency are two competencies, which Finnish project managers have high willingness to improve, but there is no such desire in Norwegian project managers. One reason for these interests in Finland can be the fact that the usage of English language and the presence of foreign experts in the Finnish construction industry have been considerably increased in the last two decades [2]. Therefore, these uncommon and specific creative tension competencies of each respondent group can be considered for the performance improvement of project managers in the relevant context.
The differences and overlaps mentioned earlier can be seen as a basis to argue that the elements of collaborative construction projects affect the required competencies for the successful performance of project managers. This means that the common elements, e.g., trust-based relationships and shared risk/reward systems, require certain core competencies, whereas the unique elements, e.g., culture and contracting parties, require context-oriented competencies. The developed hypothesis needs to be tested in future studies. However, it seems to be somewhat in line with the prior project contingency research [14,37,82], where it has been shown that different types of projects need project managers with certain types of competencies.
Finally, the last group of results presented a novel matrix model of competencies for project managers of collaborative construction projects. The novelty of this model is related to its functions and features. This model not only presents the cost-effective method (easier to improve competencies) for performance improvement of the existing project managers, but also provides new insights for employers of the project managers to know which competencies are difficult to improve and contribute to the successful performance. This also provides the cost-effective way for employers to select the right project manager for their collaborative construction project. These functions of the model are based on its two important features: addressing the contribution of competency to the successful performance, and difficulty of the improvement. This model provides new insights into the importance of the human side of project management in collaborative construction projects.
The findings can also intensify the interest in potential future research on the competencies of all the project team members in collaborative construction projects.
The findings of this study, in the big picture, present a novel conceptual perspective (the matrix model) toward project managers' competencies. The focus of this different perspective is on two important aspects of competencies (contribution to successful performance and difficulty of improvement) which have been very limitedly addressed in the previous competency studies in an integrated manner. Moreover, addressing the subject of interest in the context of collaborative construction projects contributes toward the body of knowledge on project managers' competencies. This contribution was accomplished through identifying those competencies which project managers of collaborative construction projects need to possess to succeed. As the implications of this research, it can be stated that project managers and their employers in collaborative construction projects need to be aware of those easy to improve and hard to improve competencies which make the greatest contribution to the successful performance. Those employers can use key, supportive and hybrid competencies (presented in this research) to recruit the right person for their projects and improve the performance of their current project managers.

Conclusions
The purpose of this study was to identify project managers' most important competencies for collaborative construction projects, which finally led to the development of a matrix-form competency model. This model has an explanatory capacity for structuring various competencies in a novel manner that can be useful for individual project managers together with organizations in charge of collaborative construction projects. The following conclusions concerning project managers of collaborative construction projects (particularly in Finland and Norway) are based on the obtained results:

•
Elements of collaborative construction projects can affect the required competencies for the successful performance of project managers. The common elements, e.g., trust-based collaboration and cooperation, shared risk-reward system, require certain core competencies, whereas the unique elements, e.g., culture and contracting parties, require certain context-oriented competencies; • The profile of the project managers' competencies, in the big picture, represents individual efficiency and effectiveness, combined with teamwork, mutual understanding and trust, collaborative cooperation, and no-blame-related behavior; • Trustworthiness, stress tolerance, initiative, optimism and flexibility competencies are cost-effective criteria for recruiting the project managers; • Group capabilities, management, leadership and production efficiency competencies represent sources for the performance improvement of the existing project managers; • Conflict management, self-assessment, decision quality and understanding others competencies are sources for both the selection of the project managers and improving the performances of the existing ones; • The 11 threshold competencies (presented in Figure 10), required for the minimally accepted level of work, represent the lower cut off point below which the project manager would not be considered competent.
These findings contribute to the body of knowledge on project managers' competencies through providing academic and practical insights for competence-based selection and performance improvement of the project managers in the context of collaborative construction projects. The generalizability of the findings of this study is still rather limited. The research is based on input from professionals in Norway and Finland, but the challenges and issues discussed in the paper are of a general nature, relevant well beyond the Nordic countries. As with all new concepts, the matrix model of competencies needs validation in other contexts before consideration as a generally accepted model. Therefore, further studies in various regions and business conditions are a potential area for further research. The obtained results provide a basis for the following research areas, which can form starting points for the future studies:

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How to select project managers of collaborative construction projects based on the presented categories in the matrix model, developed in this study; • How to train competencies in those different categories; • How to develop a frame of reference for successful/superior performance of project managers in collaborative construction projects; • How to adapt the developed competency model in this study to other sectors of construction projects; • Although this study found no fundamental differences in the viewpoints of different age groups among the survey respondents, more detailed analysis on the potential impact of project managers' experience/age can be considered as an area for further relevant research. Funding: This research received no external funding.

Institutional Review Board Statement: Not applicable.
Informed Consent Statement: Not applicable.

Data Availability Statement:
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to privacy and ethical restrictions.

Conflicts of Interest:
The authors declare no conflict of interest.

Appendix A
Project managers' competencies in construction projects, identified from the literature.

Reference Appearance
Risk management [22,54,63]  Stress tolerance To maintain performance when facing workload pressures and or organizational impediments.
The level of my performance weakens when I work under pressure or when stressed.
I can handle tasks and situations that are unpleasant and stressful.

Commitment
Adopting the goals of the group or organization.
I act according to the way determined by my environment and I respect the organizational norms.
My own objectives differ from the objectives of the group.
Production efficiency Performing tasks quickly and according to high standards.
I organize my tasks in a way that speeds up their accomplishment.
I delegate tasks and utilize resources efficiently even if they would be (are) scarce.

Decision quality
Making decisions based on principles, purposes and values.
In my decisions I take into account problems which may arise.
I foresee the implications of different options.
Leveraging diversity Appreciative attitude towards others. Respecting people from different backgrounds.
I see diversity as an opportunity, and I try to create an environment where diverse people can thrive.
I am biased against people because of their backgrounds.
Organizational savvy Understanding and utilizing organizational dynamics in order to achieve objectives.
I recognize the current culture and atmosphere of the organization.
I use formal and informal communication channels efficiently.
Group capabilities the capability of working cooperatively with others, to be part of a team, to work together, as opposed to working separately or competitively.
It is difficult or unpleasant for me to encourage and motivate other people.
In a team, I act in a way that creates friendship and team spirit between the group members.