The Advantages of Industry 4.0 Applications for Sustainability: Results from a Sample of Manufacturing Companies

: Far from being exclusively related to economic considerations, the advantages of Industry 4.0 applications also include environmental and social concerns. An increasing amount of scientiﬁc publications relate the implementation of the fourth industrial revolution paradigm to sustainability. Several studies reported opportunities of Industry 4.0 implementation particularly to the environmental dimension of sustainability, e.g., through improved logistics streams and lowered waste from production. The present research aims at providing evidence on whether manufacturing companies consider Industry 4.0 implementation as an advantage contributing to environmental and social sustainability in terms of lower environmental impact of production, as well as higher physical relief for workers and ﬂexibility of work organisation. The results were an attempt to study such relations with company sizes, industry sectors, turnover and self-assessed levels of digitalization varying. The sample encompasses 65 companies located in the Marche region (Italy). The results show that overall the perception of economic opportunities prevail, while the association of a beneﬁcial impact of Industry 4.0 on environmental sustainability is rather low across companies, regardless of their size, turnover and digital level. As for the statistically signiﬁcant variables, the results suggest a strong association of the size and the digital level to speciﬁc Industry 4.0 related advantages, referring to the social and economic dimension of sustainability, respectively.


Introduction
The core of Industry 4.0 lies in the real-time and smart connection of people, machines and objects for the management of production systems [1]. The introduction of Cyber-Physical Systems (CPS) will enable the digitalisation of the entire value chains, reshaping relations between producers, consumers and suppliers [2]. Consequently, a large scale and heterogeneity of components is emerging also driven by the Key Enabling Technologies (KET) of Industry 4.0, encompassing, among other things, advance manufacturing solutions, additive manufacturing, augmented and virtual reality, simulation, Internet of Things (IoT), cloud, big data and cyber security. Industry 4.0 solutions exhibit an increasing application potential across several businesses and industries. However, the success of Industry 4.0 and the approaches under it will ultimately depend on whether small and medium sized enterprises (SMEs) can adopt and implement these technologies, as they represent the backbone of several productive systems worldwide [3]. The process leading SMEs shifting their production

Literature Review
The "Brundtland" report published in 1987 by the World Commission coined the term "sustainable development", giving rise to an increasing societal awareness towards the environmental impact of industrial manufacturing [23]. The emerging environmental concerns such as availability of non-renewable resources and stricter legislation, as well as consumer preference for environmentally friendly products, require manufacturing companies to consider sustainability in their supply chain [24]. From a sustainability perspective, focusing exclusively on the maximisation of profits without considering additional stakeholder concerns is becoming less tolerable [25]. Nevertheless, it is logical to think that the economic profitability of the company is an indispensable element for its existence [26]. The consideration of aspects other than the economic implications of sustainability has the potential to boost innovation and enhance the competitiveness of companies [27]. Against this background, an increasing number of scholars argue that Industry 4.0 holds great opportunity for realizing sustainable industrial value creation on all three dimensions of sustainability: Economic, social and environmental [12].
The terms Industry 4.0 and fourth industrial revolution were used for the first time at the Hannover Fair in 2011, referring to a smart real time connection between people, machines and objects with the aim of managing a production system [1]. Industry 4.0 has been defined as the convergence of Internet technologies in the manufacturing environment [28]. The concept of Industry 4.0 includes several technologies, which are defined as the key enabling technologies of this strategic initiative; these are: Advanced manufacturing solutions, additive manufacturing, augmented and virtual reality, simulation, horizontal and vertical data integration, industrial Internet, cloud computing, cyber security, big data and analytics. Internet of things (IoT) and Cyber Physical Systems (CPS) make it possible to create networks incorporating the entire manufacturing processes converting factories into smart environments in which the physical and the virtual world cooperate [29]. Over the last few years the attention that has been given and the number of conferences and studies dedicated to the topic of Industry 4.0 have grown exponentially [30], not only in the academic environment but also from managers who recognize the potential of this paradigm-shift impacting the entire concept of production, the processes involved as well as the dynamics among suppliers and customers. The fourth industrial revolution has created several opportunities and challenges for SMEs [31,32], which can take advantage of these technologies to increase their flexibility, productivity and competitiveness [9,28].
From a sustainability point of view, Stock and Selinger [12] identified Industry 4.0 as a step towards a more sustainable industrial value creation, arguing that industrial value creation must be geared towards sustainability and Industry 4.0, providing immense opportunities for the realization of sustainable manufacturing. By providing detailed information on each point of the production process, resource and energy use can be optimized over the entire value network [22]. The scientific debate considers the Triple Bottom Line construct [23], consisting of the analysis of environmental, economic and social aspects of sustainability. Authors mentioning such an approach included in their analysis combinations of these dimensions such as environmental [33], economic and social [24] as well as the entire TBL construct [14]. A comprehensive review of the state of the art in terms of environmental and economic aspects reported that research activities are clearly unbalanced and focus mainly on energy as specific input mean [24]. In fact, Morelli [34], relates the use of environmentally responsible and sustainable energy sources and the effort of improving energy efficiency to the concept of sustainability. Vance et al. [35] show that a reduction of energy consumption can be considered as a step towards sustainability. Bonilla et al. [36] provided a systematic overview of scientific publications relating Industry 4.0 to environmental sustainability, drawing conclusions about the uncertainty of the long-run impact of digital transformation on environmental sustainability. The impacts on sustainability have been assessed in relation to specific key enabling technologies on the sustainable value creation of a manufacturing company such as IoT on reshoring. In logistics [12], a reduction in the number of transport processes as well as unnecessary material flows can be achieved [22]. Decentralised production, which can be translated into reduced transport distances based on relocating production closer to where products and production equipment are purchased, leads to a decrease in both logistics costs and environmental impact [5,37]. This can be achieved with the use of new production technologies such as additive manufacturing that can help to shorten and reduce the size of the value chain [38]. Furthermore, the number of wrong deliveries, unnecessary waiting time and damaged products can be reduced by data transparency throughout the entire supply chain [39,40]. In other words technologies associated with the concept of Industry 4.0 are considered to have the unique potential to unlock environmentally sustainable manufacturing [33], and positive relations to environmental sustainability are detected in terms of load balancing optimisation, leading to a reduction in energy consumption [41,42]. Further aspects which are related to environmental sustainability are product usage, waste, end-life products and information [36].
Additional sources relate Industry 4.0 to the concept of sustainability from an ecological point of view and at the same time link it to the social perspective. Since social sustainability is necessary to the fulfilment of the three dimensions of the TBL, it deserves a specific and detailed analysis [43]. The increasing level of automation [44] and collaboration between the workers and the machines [45] will improve people's working conditions. This is particularly advantageous, since the proportion of older workers will increase due to the age shift [22]. It implements collaborative robots into the workstations, which are non-ergonomically designed and physically demanding and preserves workers' health and consequently the productivity of the production system in the long term [18,46]. Smart worker assistance systems will support operators in performing tasks that are monotonous and repetitive, resulting in higher employee satisfaction and motivation [47]. These approaches meet the current demographic challenges since the working environment needs to be designed age-appropriately [28]. These are just examples of the impact Industry 4.0 has on sustainability. From the literature review, it has been shown that even sustainability has a positive impact on the implementation of Industry 4.0, by working as an incentive for the implementation of the related technologies. As Kiel et al. [14] state, the environmental and social opportunities which Industry 4.0 has to offer have a positive impact on the companies' tendency to start the implementation process of Industry 4.0. In this regard, literature identifies sustainability also as the implementation and usage of tools, methods, processes, approaches and practices that aim at improving the company's contribution to sustainable development [48], which is the main focus of the present study.

Research Question
The literature analysis shows numerous advantages of the introduction of technologies and concepts of Industry 4.0 for sustainability. In the literature, however, there is currently a limited number of studies analysing and reporting on the differences between the perceived opportunities of Industry 4.0 implementation on sustainability in larger companies and SMEs. We see here a large gap in scientific research, which should be tackled, increasing targeted research in this field. Therefore, in this paper we focus on the influence of Industry 4.0 on sustainability, adopting a TBL approach, among manufacturing SMEs and large companies. In detail, the present work will answer the research question of whether manufacturing companies perceive the economic, environmental and social sustainability opportunities driven from the implementation of Industry 4.0. More specifically the following research questions (RQ) have been formulated: RQ1: To what extent do manufacturing companies consider Industry 4.0 as an advantage related to economic, social and environmental sustainability? RQ2: Which variables might explain differences in the perception of economic, social and environmental sustainability among companies?
To answer these questions, the advantages and challenges related to the implementation of Industry 4.0 technologies and concepts perceived by companies were analysed, considering the TBL of sustainability, which covers different aspects such as the economic, environmental and social dimensions [23,49,50]. Furthermore, the paper investigated whether specific characteristics of companies, such as size and digital level of the company, are associated with differences in the perception of specific dimensions of sustainability (economic, social or environmental) as an advantage driven by Industry 4.0 implementation. This approach is aligned to the study of Müller et al., which effectively examined differences in size, industry sector and the company's role as an Industry 4.0 provider or user in determining the Industry 4.0-related opportunities and challenges [20]. Following this comprehensive approach investigating the three dimensions of sustainability, we formulated specific hypotheses related to RQ1 and RQ2, aiming at deepening the focus on the perception of environmental sustainability. In this regard, we expect a relatively low perception of Industry 4.0 implementation to be an advantage for the sustainability performance of the companies, regardless of their size and digital level: Hypothesis 1 (H1). Industry 4.0 is not considered a main advantage related to environmental sustainability.

Hypothesis 2 (H2).
Companies do not perceive environmental sustainability as an advantage, regardless of their size in terms of both number of employees and turnover.

Hypothesis 3 (H3).
Companies do not perceive environmental sustainability as an advantage, regardless of their digital level.
RQ1 is linked to H1, while RQ2 entails an in-depth discussion following H1 and H2. The next section will provide more details on the methods employed to test the hypotheses, the approach used to collect data and the metrics used to derive the digital level of companies in the considered sample.

Research Methodology
3.1. The Online Self-Assessment Tool "Digital Check" The assessment of the digital level of companies and the perceived advantages relating to the implementation of Industry 4.0 was part of the survey, distributed among a sample of manufacturing companies associated to Confindustria Marche Nord, the industrial representative association located in Central Italy Marche Region. An online tool named "Digital Check" allowed local companies to self-assess their digital level and readiness for the Industry 4.0 paradigm. The survey was defined considering the general structure and objectives of existing self-assessment tools [51,52] and adapted according to the challenges SMEs face in initiating digital transformation, considering recent scientific works on this topic carried out, among others, by the authors of the present work [31]. The "Digital Check" comprises 26 questions across the following dimensions: (1) Strategy, (2) processes, (3) Industry 4.0, (4) employees, (5) Information Technology (IT) and data security. The current digital level perceived by the individual companies responding to the survey was calculated considering the average of selected questions (see those marked with •) within each dimension as indicated in Table 1. Likert Q-6 Integration of IT in production systems.
Likert • Q-7 Flexibility of production systems.
Likert • Q-8 Digitalisation of organisation and processes.
Likert Respondents could rate the questions within each dimension of the survey along a five levels Likert Scale ranging from 1 (low implementation level) to 5 (high implementation level), according to the specific topic of analysis, as shown in the example in Table 2. Table 2. Exemplary scale according to topic and dimension in the survey.

Question topic
To what extent has your company defined a strategy toward Industry 4.0 1 No strategy has been formulated or planned 2 Planning to develop a strategy in the short term Scale 3 Development of the strategy currently ongoing 4 The strategy is formulated but not yet implemented 5 The strategy is fully implemented The overall digital level resulted from the average values assigned by companies to each item object of evaluation across the different dimensions considered. The results of the survey enabled to assign one category portraying the self-assessed digital level of each company taking part to the survey, namely into so called (i) "Digital Newcomers", (ii) "Companies in Transition" and (iii) "Top Performers" (Table 3). Table 3. Description of digital levels.

Digital Newcomers (Low digital level)
Companies belonging to this level do not consider the transition to Industry 4.0 relevant to their business or are testing the first pilot projects in isolated areas to test possible effects. A concrete strategy for digitization is still under development or not yet at an advanced stage. Few or none of the production processes support IT integration. The sharing of corporate data and information is still limited. The skills of employees are still inadequate in the Industry 4.0 perspective.

Companies in Transition (Medium digital level)
Companies belonging to this level demonstrate that they have already incorporated the concept of Industry 4.0 into their strategic orientation. They are taking the first steps towards sharing information both at company level and with business partners. IT services are supported and sometimes incorporated into production processes. In certain areas the skills of employees are proving to be enough to apply/test Industry 4.0 concepts. This type of company is not new to collaborations with research institutes and/or strategic consulting firms.

Top-Performer (High digital level)
Companies of this level are in the advanced stage of implementation of Industry 4.0. A strategy has already been implemented. Investments in multiple areas are either in the planning stage or already underway. The sharing of information at company level between departments and with suppliers is fully or largely integrated. Production processes are integrated with IT systems thanks to which production data are collected and used for monitoring and optimisation of the processes themselves. This type of company has concluded several collaboration experiences with different partners (e.g., applied research institutes, consulting companies, system integrators). The variable representing the digital level of companies will be employed to test the RQ2 of the present study, namely which characteristics of companies may be associated with different perceptions of sustainability, together with other attributes that were subjects of the survey such as size (number of employees) and turnover (EUR) as summarised in Table 4. A specific question in the survey (Q-16) assesses the advantages of Industry 4.0 perceived by companies, considering the TBL as identified in prior studies and systematically outlined in Table 5.  [20,73] Most advantages included in the survey relate to the economic line that turned out to be relatively more covered by previous related studies in the recent scientific literature. Being a multiple-response question, respondents could express more preferences (in the specific case up to three questions): The typology of the question was considered for the choice of the proper statistical test searching for an association between attributes of the companies such as size, turnover and digital level with the perception of the different advantages related to Industry 4.0 (Section 3.3).

Data Collection and Sample
The data derived with Digital Check were collected via an online survey available to be filled out from 15 October 2018 to 18 November 2018. The survey was managed by Confindustria Marche Nord (regional unit of the General Confederation of Italian Industry) and distributed among a sample of companies operating in the Marche Region (Italy). The sample consists of 65 companies, mainly operating in the machine construction (40%), chemical (13%) and footwear (7%) sectors. Approximately 70% of the respondent companies could be classified as SMEs employing less than 250 collaborators and having less than 50 million Euro of yearly turnover (see Table 6).  Figure 1 shows the results of the survey and the categorization of the sample into the three digital levels as explained before. A positive result of the survey is that few companies ended up as digital newcomers (4.6% of total) and therefore at the outset of introducing Industry 4.0 and digitalization into their company. While 20.0% of the respondents belong to the digital top performers, most of the participating companies are in transition and therefore on an average digital level (75.4%). Taking a further look only to SMEs we can see that especially those that are newcomers are almost all SMEs, while top performers seem to be almost all medium to large companies. It is interesting to note that the companies in the transitional phase consist nearly equally of small, medium-sized and large companies. companies. It is interesting to note that the companies in the transitional phase consist nearly equally of small, medium-sized and large companies.

Data Analysis
The structure and the results of the Digital Check provide the opportunity to answer the research questions of the present study, and particularly to test whether an association between variables exists. In the analysis, we employed the multiple response to question 16 (Q-16) assigned by companies ordered in different variables, namely size, turnover and digital level, to study whether there are differences in the perceptions of sustainability among a group of companies. The analysis and modelling of categorical variables have been the focus of significant research activities such as [74]. Considering the multiple-response nature of the data, the work of Agresti and Liu and Thomas and Decady were considered [75,76]. Pearson Chi-squared test for nominal (categorical) data was performed. For the data analysis, the statistical software SPSS v.19 was employed.

Results
This section presents the main results of the analysis. Section 4.1 answers RQ1 and the related H1. Sections 4.2-4.4 deal with RQ2. In this regard, while the Sections 4.2 and 4.3 provide evidence to assess H2, Section 4.4 exclusively addresses H3.

Advantages Related to Industry 4.0 Implementation
As shown in Error! Reference source not found. the main advantages linked to the adoption of Industry 4.0 concern the possibility of increasing the quality of products through the reduction of errors (63.1%). Advantages in the management of logistics (53.8%) and time savings (50.8%) are also considered major benefit following the implementation of Industry 4.0 concepts. Within the social dimension of sustainability, less than half of the respondents consider Industry 4.0 beneficial to lower physical stress of collaborators (40.0%). The percentage decreases with consideration to the advantage related to higher flexibility of work (24.6%). A rather low number of respondents consider Industry 4.0 applications as an opportunity to improve sustainability, e.g., reducing negative environmental impact of manufacturing processes (6.2%). Regarding RQ1, we conclude overall that companies consider economic sustainability at a higher extent compared to the social and environmental dimension. The consideration of environmental sustainability as an advantage among

Data Analysis
The structure and the results of the Digital Check provide the opportunity to answer the research questions of the present study, and particularly to test whether an association between variables exists. In the analysis, we employed the multiple response to question 16 (Q-16) assigned by companies ordered in different variables, namely size, turnover and digital level, to study whether there are differences in the perceptions of sustainability among a group of companies. The analysis and modelling of categorical variables have been the focus of significant research activities such as [74]. Considering the multiple-response nature of the data, the work of Agresti and Liu and Thomas and Decady were considered [75,76]. Pearson Chi-squared test for nominal (categorical) data was performed. For the data analysis, the statistical software SPSS v.19 was employed.

Results
This section presents the main results of the analysis. Section 4.1 answers RQ1 and the related H1.

Advantages Related to Industry 4.0 Implementation
As shown in Figure 2 the main advantages linked to the adoption of Industry 4.0 concern the possibility of increasing the quality of products through the reduction of errors (63.1%). Advantages in the management of logistics (53.8%) and time savings (50.8%) are also considered major benefit following the implementation of Industry 4.0 concepts. Within the social dimension of sustainability, less than half of the respondents consider Industry 4.0 beneficial to lower physical stress of collaborators (40.0%). The percentage decreases with consideration to the advantage related to higher flexibility of work (24.6%). A rather low number of respondents consider Industry 4.0 applications as an opportunity to improve sustainability, e.g., reducing negative environmental impact of manufacturing processes (6.2%). Regarding RQ1, we conclude overall that companies consider economic sustainability at a higher extent compared to the social and environmental dimension. The consideration of environmental sustainability as an advantage among companies is very low, hence H1 is supported.

Company Size as Variable for Different Associations in the Perception of Sustainability
The first categorical variable tested for a potential association with the perception of Industry 4.0 as beneficial for sustainability in manufacturing is the size of the company, which considers the number of employees. There is a strong association (χ 2 = 7.093, p < 0.019) between the size of the company and the beneficial perception of Industry 4.0 in achieving more flexible organisation of work (Table 7). Indeed, only a very marginal percentage of small companies (4.3%) perceive this aspect of social sustainability as beneficial, against a substantial 34.8% and 36.8% of medium and large companies, respectively. Considering the variable environmental sustainability as advantage of Industry 4.0, the available data show no significant association (χ 2 = 1.761, p < 0.415). As for the statistically significant variables referring to RQ2, results suggest a strong association between the size of the company and the advantage of higher flexibility of work organization within the social dimension of sustainability. None of the other advantages related to other dimensions of sustainability (economic and environmental) show a significant association with size. Consequently, H2 is supported, since environmental sustainability is not perceived as an advantage related to Industry 4.0 regardless of the size of the company.

Turnover of the Company as Variable for Different Association in the Perception of Sustainability
Following the same approach, the categorical variable referring to the yearly turnover of the company (EUR) was tested against the hypothesis of independence with the perception of Industry 4.0 as beneficial for specific economic, social and environmental dimensions concerning sustainability in manufacturing (see Table 8). In this case the number of respondents covers 92.3% of the entire sample (N = 60) since five companies opted for not disclosing their category of yearly turnover. The Chi-Squared statistics indicate the existence of no significant association across the economic, social and environmental advantages proposed, such as cost savings (χ 2 = 0.051, p < 0.0975), lower physical stress (χ 2 = 0.008, p < 0.996) and environmental impact (χ 2 = 4.058, p < 0.131), respectively. The answer to RQ2 is that the variable turnover does not show any significant association to specific advantages

Company Size as Variable for Different Associations in the Perception of Sustainability
The first categorical variable tested for a potential association with the perception of Industry 4.0 as beneficial for sustainability in manufacturing is the size of the company, which considers the number of employees. There is a strong association (χ 2 = 7.093, p < 0.019) between the size of the company and the beneficial perception of Industry 4.0 in achieving more flexible organisation of work (Table 7). Indeed, only a very marginal percentage of small companies (4.3%) perceive this aspect of social sustainability as beneficial, against a substantial 34.8% and 36.8% of medium and large companies, respectively. Considering the variable environmental sustainability as advantage of Industry 4.0, the available data show no significant association (χ 2 = 1.761, p < 0.415). As for the statistically significant variables referring to RQ2, results suggest a strong association between the size of the company and the advantage of higher flexibility of work organization within the social dimension of sustainability. None of the other advantages related to other dimensions of sustainability (economic and environmental) show a significant association with size. Consequently, H2 is supported, since environmental sustainability is not perceived as an advantage related to Industry 4.0 regardless of the size of the company.

Turnover of the Company as Variable for Different Association in the Perception of Sustainability
Following the same approach, the categorical variable referring to the yearly turnover of the company (EUR) was tested against the hypothesis of independence with the perception of Industry 4.0 as beneficial for specific economic, social and environmental dimensions concerning sustainability in manufacturing (see Table 8). In this case the number of respondents covers 92.3% of the entire sample (N = 60) since five companies opted for not disclosing their category of yearly turnover. The Chi-Squared statistics indicate the existence of no significant association across the economic, social and environmental advantages proposed, such as cost savings (χ 2 = 0.051, p < 0.0975), lower physical stress (χ 2 = 0.008, p < 0.996) and environmental impact (χ 2 = 4.058, p < 0.131), respectively. The answer to RQ2 is that the variable turnover does not show any significant association to specific advantages related to the economic, social and environmental dimensions of sustainability. Therefore, H2 is supported.

Digital Level as Variable for Different Association in the Perception of Sustainability
Finally, a test was performed to investigate whether the digital level of the company is associated with advantages related to Industry 4.0 applications (see Table 9). The Chi-Squared statistics indicate the existence of a significant association between the advantage of Industry 4.0 for logistics and the digital level of the company (χ 2 = 8.035, p < 0.018). This provides an additional element to answer RQ2 since the variable digital level results associated to a specific advantage of Industry 4.0 related to the economic dimension of sustainability and related to the optimisation of logistics and warehousing. The association of Industry 4.0 as beneficial for environmental sustainability remains low (χ 2 = 0.250), regardless of the digital level of companies. Consequently, H2 is supported.

General Discussion of Results
The present research studied whether differences exist in the perception of the advantages related to the implementation of Industry 4.0 within a sample of manufacturing companies located in the Marche Region (Italy). In particular, the existence of differences in the association of Industry 4.0 to specific economic, social and environmental sustainability concerns was investigated considering as the explanatory variable "company specific characteristics" such as number of employees, yearly turnover and digital level. With respect to the RQ1 formulated in the present paper, the overall analysis of the sample indicates that companies in general rate economic advantages among the most relevant factors, compared to other social and environmental benefits, resulting from Industry 4.0. This evidence is aligned to the existing literature, indicating a consistent number of economic opportunities at the base of the implementation of Industry 4.0 technologies and concepts, which can also be gained in the context of SMEs [77,78]. Similar conclusions were drawn from other studies in relation to the most recurrent advantages rated in the sample object of the present research, such as quality (reduction of errors) and logistics [79,80]. Furthermore, the relatively low perception in terms of reduction of workforce, following Industry 4.0, complies with the current literature on the topic, portraying unified perspectives on potential gain or loss in the number of employees in industry [81]. Social aspects of sustainability, such as more flexible organisation of work and lower physical stress, contributing to improved working environment for employees, have been rated overall of secondary importance, although previous studies acknowledged such aspects as drivers for Industry 4.0 implementation [20]. Environmental opportunities emerge as irrelevant drivers relating to the implementation of Industry 4.0, within the considered sample. A very limited number of respondents declared considering Industry 4.0 as an opportunity to improve their companies. This evidence differs from the findings of previous studies [82], indicating environmental opportunities as relevant drivers for a tendency towards Industry 4.0 [20,28]. Another relevant study on this field showed with a higher degree of details that green production in general, as well as energy and resource management, resulted as high priority within the surveyed sample of companies [22]. The results of this analysis offered enough elements to confirm the proposed H1, acknowledging the absence of sustainable opportunities influencing the tendency for Industry 4.0 implementation. Consequently, at the aggregate level of the sample, economic opportunities are considered prominent.
Answering RQ2 implied studying the opportunities associated to Industry 4.0 according to different characteristics of the sample such as size, turnover and digital level. With respect to company size in terms of employees, the findings for RQ2 revealed the existence of a stronger association for large companies regarding the perceived social opportunity, related to the higher flexibility in the organisation of work. The latter is acknowledged as being enabled by Industry 4.0 [58] and in terms of reshaping organisations is considered a driver for sustainability [83]. In the literature, SMEs are recognised for their higher degree of flexibility compared to large companies [84], due to specific characteristics already enabling them to react to increasingly volatile market conditions [85]. This aspect may explain the higher relevance attributed by larger companies to Industry 4.0 implementation as potentially nurturing their demand for higher flexibility. Considering the advantage of cost, our research did not find any association with size. In this respect a recent study identified a greater relevance of this advantage for larger companies, such as multinational enterprises, compared to SMEs due to their higher cost reduction and profitability expectations [86]. There is no strong association of Industry 4.0 to environmental sustainability, regardless of the size of the companies. For this reason, the proposed H2 is confirmed.
The analysis considering yearly level of turnover did not show significant associations to specific Industry 4.0 related advantages. This confirmed our initial hypothesis (H2), related to the turnover as a potential variable resulting in different associations to environmental sustainability among companies. Several scholars argue that the lack of financial resources in general may represent a main constraint to the implementation of Industry 4.0 concepts, particularly across SMEs [87][88][89]. In this respect, the results of our study could not indicate clear directions on whether large companies, due to their higher investment capabilities, rate specific advantages differently compared to SMEs.
The results obtained analysing the digital level against the different advantages relating to Industry 4.0 do not show any significance association for environmental and social sustainability. Therefore, companies of the sample, regardless of their digital level, as proposed in H3, do not associate significantly environmental sustainability as a driving advantage for application of Industry 4.0. In this regard, the results indicate for RQ2 a rather stronger association for economic sustainability, such as the opportunity for optimization of logistics and warehousing, among companies rated with a higher digital level, namely companies in transition and top-performer. Reviewing the scientific literature on the topic, we noted that the association between digital level and the perceived advantages relating to Industry 4.0 implementation appears have limited assessment. While the existence of assessment of the adoption of specific typologies of technologies according to the maturity level of implementation of Industry 4.0 is acknowledged [90], the review of existing literature did not yield to the identification of studies analysing the aforementioned association between digital level and advantages of Industry 4.0. While not relating to social or environmental sustainability, we observe that companies with a higher digital level consider the advantages of Industry 4.0 for efficient logistics and warehousing more relevant, compared to less digitalised companies. Considering the limited number of similar studies on this specific matter, it is challenging to draw further conclusions in comparison with existing literature. A partial explanation for this association can be suggested considering the general large size of companies which achieved the highest digital level (top performer) within the considered sample. In this respect, large companies may consider Industry 4.0 applications more relevant for logistics, being more advanced in integrating information technology systems into their production facilities compared to SMEs facing more obstacles to their integration in digital supply chain [91,92].

Implications for Practitioners and Academia
The results of this study are relevant for researchers as well as for practitioners from industry and especially managers of SMEs. As already seen in the literature review there is a lack of investigation concerning the current status as well as opportunities for the introduction of Industry 4.0 and digitalization in companies. To be precise, the literature review showed that there are lots of contributions to presenting different concepts and technologies for Industry 4.0, but not that many works that give an insight into already ongoing projects to introduce Industry 4.0 or its results. With this work and survey, we provide information from the perspective of companies themselves and how they see the impact and advantages of Industry 4.0 regarding economic, social and environmental aspects.
The study provides valuable information for practitioners and mangers of SMEs. First of all, the study used a self-assessment tool adapted to the needs of SMEs to assess the current status of companies in introducing Industry 4.0. The results show that almost all companies started to deal with the introduction of Industry 4.0. This is an important result for all those companies that did not yet start to implement any kind of measure, as it would mean that they are already far behind most companies and thus that intervention measures are compelling. In addition, this kind of benchmarking data shows also that for most of the companies there is still a long way to go to be fully digitalized and to become a top-performer.
An unfortunately sobering result of this study is that most of the companies (including SMEs as well as large enterprises) do not perceive Industry 4.0 as a chance to enhance sustainability (especially environmental and social sustainability). This should be an important input for researchers working in the area of Industry 4.0 and sustainability, as it shows that there is still a need to raise awareness of the opportunities arising from the introduction of Industry 4.0 to increase sustainability and performance aspects as already shown by recent studies [73,93,94]. In this respect, these results may suggest that, e.g., regional business and industrial associations update accordingly the programs offered on digital transformation and Industry 4.0 toward the topics increasingly relevant but currently less mastered by companies, such as the social and environmental opportunities of Industry 4.0. In addition, there seems to be a general lack of enterprises in perceiving sustainability as an important aim for the future, combining long-term economic aspects with social and environmental aspects. Therefore, it will be important for the future to conduct, e.g., case study research in order to provide information of real case studies where Industry 4.0 contributes to increasing sustainability and at the same time to improving the overall performance of the company. Targeted actions could also consist in knowledge transfer, providing more information about the relationship between Industry 4.0 and sustainability. As the lack of perception of advantages of Industry 4.0 concerning sustainability seems to be evident not only for SMEs, but also for large companies, further studies should also motivate large companies with higher financial and human resources to take a first step in implementing measures. Table 10 summarizes all identified implications in a sort of action plan.

Limitations
We want to note that our study might have certain limitations that need to be considered. While we consider the size of the sample with 65 companies as sufficient to derive generalized results and hypotheses, we are conscious of the fact that all companies are located in one specific geographical region in Italy. The study is therefore representative for all rural regions in Italy or Europe with the similar characteristics of industry sectors and company size, while there might be differences in the perception between the participating companies in this study and, e.g., companies in urban regions and heavily industrialized areas or large cities.
Further, the study was mainly targeted to assess the current state in the introduction of Industry 4.0 in the region of Marche in Italy with only a partial focus on sustainability aspects. Therefore, future research should be conducted to focus and further investigate the relationship between Industry 4.0 and sustainability. This will enable defining more specific relations between sustainability and Industry 4.0 in specific domains and to explore innovative ways to enhance the improvement of either economic or social and environmental performance and contribution of companies. Future research directions, deepening the discourse about sustainability in SMEs approached in the present study, should extend the focus of the analysis to the realm of circular economy and Industry 4.0. This foresees the development of targeted tools assessing the degree of circular economy, adapted to the requirements of SMEs, similar to the methodological work and considerations undertaken to define the structure and metrics of the self-assessment tool for digital readiness employed in the present study.
We exclude any subjective influence on the part of the research team, as data has been taken directly and without any subjective assessment or modification and evaluated using statistical methods and software.

Conclusions and Outlook
This work deals with the investigation of the advantages in the application of Industry 4.0 for sustainability. It presents the partial results of a larger survey-based study with 65 companies from the Marche region in Italy. Two research questions were set up for the study and answered based on the results. The first research question deals with whether Industry 4.0 is seen as beneficial for sustainability, considering the economic, environmental and social dimension. The results confirm the initial hypothesis (H1) that currently Industry 4.0 is not seen as beneficial for achieving environmental sustainability by most of the companies. The advantages relating to the economic dimensions of sustainability prevail also over social considerations of sustainability. The second research question deals with whether there are different views on this aspect depending on factors such as size, turnover or the digital level of the companies. Two hypotheses were also put forward that were also confirmed by the data. The first of these two hypothesis (H2) is that companies, regardless of their size (small, medium, large) and level of turnover (small, medium, large), do not consider Industry 4.0 to be advantageous for achieving environmental sustainability. The other hypothesis (H3) is that Industry 4.0 is not considered beneficial for environmental sustainability, regardless of the current digital level of companies.
While it has been shown that some recent research indicates positive links between Industry 4.0 and environmental sustainability, the results of this study show that companies are not fully aware of them. Overall, it is evident that issues such as social and environmental sustainability are often neglected by companies to the benefit of economic sustainability. We therefore see a great need for actions for knowledge transfer in the future, but also to prove a positive correlation between Industry 4.0, sustainability and the performance of companies through applied research and real industrial case studies.