Enhancing BIM implementation in the Ethiopian public construction sector: An empirical study

Abstract Recently, the popularity of BIM has grown rapidly in the public construction sector. However, only a few studies so far have been seeking to address the BIM adoption benefits and barriers in developmental public projects across the low-income countries. Thus, the study aims to investigate the benefits and barriers of BIM adoption in the context of the Ethiopian infrastructure market. To achieve the objectives, a comprehensive systematic literature review was conducted to identify BIM adoption benefits and barriers in developing countries. Then, a structured questionnaire survey was conducted to collect data from various professionals working in organizations including client, consultant, and contractor. The results indicate that Insufficient IT Infrastructure, Poor Government Help, and Lack of BIM Researches & Courses in Universities are the top ranked BIM adoption barriers in infrastructure projects. Whereas, Improved Communication Among Parties, Early Multidisciplinary Coordination, and 3D visualization perceived as the major benefits of BIM adoption in the Ethiopian context. The findings provide empirical evidences to professionals, business CEOs and policy makers for the development of future BIM adoption policy in the Ethiopian construction sector. Further, insightful recommendations were forwarded to enhance the current BIM uptake in various construction projects.


PUBLIC INTEREST STATEMENT
The study explored the advantages and the challenges of adopting building information modeling, also commonly known as BIM in the Ethiopian public construction sector. BIM is a technology-driven process that has the potential to improve the overall performance of construction projects. The result reveals that BIM has the potential to enhance collaboration and communication between major players in the construction sector; although, the limited IT infrastructure could deter its wider diffusion in infrastructure construction projects. The findings provide practical application and an insight into the key focus areas of improvement to ensure successful BIM adoption in construction firms, as well as at the project and industry levels.

Introduction
Infrastructure projects are generally considered as the fundamental structures, facilities, and systems that impact the public at large (Babatunde et al., 2012;Sinesilassie et al., 2017). This in turn makes these projects unique from their technical and financial point of view (Abd et al., 2017;Ozorhon & Karahan, 2017). Infrastructure construction projects involve multiple stakeholders throughout the project life cycle. The coordination and communication between these stakeholders are essential to enhance project management and ensure success of infrastructure projects . In this context, the planning, design, construction and delivery of infrastructure projects become complex when it comes to low-income countries (Kekana et al., 2020;Porwal & Hewage, 2013).
According to the World Bank report, the delivery of infrastructure projects in several sub-Saharan African countries lacks efficiency; and are normally knotted with delay, cost overrun, low productivity, and dispute among stakeholders (Calderon et al., 2018). As a result, construction firms become less profitable and incompetent. In addition, literature highlighted that the application of change orders due to design errors, and use of old construction techniques in developing countries are thought as the major causes of poor performance in public infrastructure projects (Ismail et al., 2017;Koops et al., 2016).
One of the ways to overcome the aforementioned problems is by introducing new technological innovations and processes such as Building Information Modeling (BIM) in the construction business operations (Ahn & Kim, 2016;Olanrewaju et al., 2020). BIM is a technological advancement which revolutionizes the technical, managerial, as well as business aspects of the construction industry. Developed nations, in particular the European countries, USA, Australia and Hong Kong enjoyed the variety of BIM benefits over the past decade Ullah et al., 2019). These countries formulated and endorsed national BIM policies and standards to enhance the adoption and diffusion of BIM across the construction sector (Kassem & Succar, 2017).
In recent years, BIM has also gained a widespread acceptance across developing countries, despite its low adoption rate in developmental infrastructure projects (Ismail et al., 2017;. For instance, Ismail et al. (2017) reported an improvement in overall BIM uptake across the Asian developing countries although suggested for further extended studies. Similarly, Murphy and Nahod, (2017) call for an in-depth investigation of BIM adoption in public construction projects for a successful BIM adoption and diffusion.
Moreover, recent studies revealed that there are only very few studies conducted in sub-Saharan African countries regarding BIM adoption in public infrastructure projects. Thus, to fill this gap, this study aims to explore the extent of BIM adoption readiness, including the benefits and barriers of adopting BIM in infrastructure projects. The study also examines the level of agreement between various respondent groups such as client, consultant, and contractor on each identified benefit and barrier. Further, the study provides key recommended actions to improve BIM diffusion across the construction market based on the findings from the factor analysis.
This study contributes to the Ethiopian construction sector by (1) for the first time providing a set of potential benefits and critical hindrance of adopting BIM particularly in public construction projects, (2) highlighting thoughtful practical implications and recommendations to enhance the current BIM uptake in construction organizations. The findings of this study will help construction business CEOs and management team to concentrate on the key areas of improvement in the organizational structure. Moreover, government officials and policy makers will be beneficial in their quest to develop a national BIM adoption standard for the Ethiopian construction sector.

Literature review
This section provides a background of BIM adoption in developing countries including the desk study techniques employed to select relevant papers for the analysis.

Systematic literature review
A Systematic Literature Review (SLR) is a technique which is used to identify and appraise relevant studies following clearly defined criterions/guidelines in order to answer a research question (Ahmed & Kassem, 2018). This review technique has been applied in several BIM-related studies.
A few examples include, Charef et al., (2019a), Samimpay & Saghatforoush, (2020), and Abanda et al., (2015). The purpose of this review was to identify the potential benefits and barriers of BIM adoption in emerging markets.
The SLR for this paper was conducted in three major stages using online research databases including Scopus and Google Scholar. The first stage of the SLR, key words such as "BIM Adoption" and "Benefits" and "Barriers" were used. The return was 318 publications in Scopus and Science Direct, and 198 in Google Scholar. After a quick review, a total of 253 papers were kept for further scrutiny.
In the second stage, inclusion/exclusion criteria were set for content analysis. These criteria include publication Year (between 2012 and 2020), relevancy, location, and language. This time, 174 papers were selected from both databases. Finally, a total of 31 valid conference and journal publications were selected after an in-depth review of studies that are focusing on developing countries. From these, 13 publications were filtered for questionnaire preparation, abandoning the remaining papers that have similarity to the research output, and non-rigorous data analysis. Figure 1 presents the systematic literature review flow chart adopted for this study.

BIM adoption in developing countries
Several construction organizations, professional associations, and government agencies have advocated the use of BIM in the AEC industry to improve project management and facilitate coordination among stakeholders in construction projects . Although the extent of BIM implementation varies around the world, developed nations such as the United States (Cheng & Lu, 2015), Australia (Kassem & Succar, 2017), and few European countries (Charef et al., 2019b) have led to the rapid diffusion of BIM across the AEC industry. These countries in particular utilized several in-depth research projects and strategies in certain knowledge areas to ensure effective adoption in both the public and private sectors (Chong et al., 2016).
In recent years, however, several developing countries have been trying to catch up and improve the current level of BIM uptake across the construction industry . Indeed, the potential benefits such as, improved architectural visualization , collaboration among parties (Husain et al., 2018), and effective asset management  are some of the major driving factors that persuade BIM adoption in these construction markets. In contrast, prior studies also highlighted challenges and barriers of BIM adoption in low-income countries, despite the efforts by governments and respective stakeholders in the construction sector (Amuda-Yusuf, 2018;Olanrewaju et al., 2020). These hindrances are ranging from problems associated with low IT infrastructure, financial competency of construction firms, poor collaboration, lack of BIM courses in universities, and cultural barriers (Ghaffarianhoseini et al., 2017;Kekana et al., 2020).
Globally, most BIM related empirical studies in developing countries have been centered on three themes: (1) BIM benefits, (2) BIM barriers, and (3) BIM readiness (Abubakar et al., 2014;Chan et al., 2019;Olanrewaju et al., 2020). These studies examined the critical BIM attributes including at the pre and post adoption stages across the construction sectors. Meanwhile, there is also a growing interest in BIM implementation to the public infrastructure construction sector either in the design, construction, and asset management of road and water works (Ahuja et al., 2020). In such a case, management and utilization of project data pertinent to project life cycle are a few of the center of focus in the public infrastructure sector (Chong et al., 2016). More so, the gap in the economic development of countries and the differences in rate of BIM adoption across various disciplines have led to the notion that several researches are needed to contextualize the benefits and barriers of BIM in different geographical locations around the world. Thus, the current study aims to continue the rigorous efforts being taken towards the exploration of the key BIM attributes to enhance BIM implementation in the public sector

Methodology
This section discusses the research design, and data analysis techniques employed in the current research.

Research design
The study employed a structural questionnaire survey designed using the SLR and a mini Delphi study for contextualizing the pre-selected CSFs. The first draft of the structured questionnaire was designed based on an extensive systematic literature review to choose the potential benefits and critical barriers of BIM adoption in public infrastructure projects. Then, the draft questionnaire was then sent to three experienced professionals; two from the industry, and one from academia for content analysis prior to data collection. These experts have more than 15 years of professional's experience in the construction sector. Using the mini two-stage Delphi survey, the experts were initially asked to evaluate the pre-selected 28 benefits and 20 barriers. After qualitative examination of the responses, the first stage of the mini Delphi survey resulted in 18 benefits and 19 barriers. During the second stage, the experts were able to re-evaluate their first assessment and respond back in a week's time. Finally, the experts sent a revised 20 benefits and 17 barriers of BIM adoption. Tables 1 and 2 summarize the common benefits and barriers of BIM adoption used in the present study based on the systematic literature review.
The final structured questionnaire draft was then prepared to collect data among professionals working in public infrastructure projects across the Ethiopian construction sector. The target respondents comprised from organizations including client, consultant, and contractor. The questionnaire draft has three sections. The first section of the questionnaire solicited to acquire general demographic information of respondents including organization profile of experts. Whereas, the second and third sections of the questionnaire comprised the potential benefits and barriers of BIM adoption in infrastructure projects. The responses were collected using a 5-point Likert scale, ranging in ascending order from 1 = Strongly Disagree to 5 = Strongly Agree. It's also common to use a 5-point Likert scale in previous studies.

Data collection
Due to the emerging nature of the topic, purposive sampling was employed to minimize bias and collect a reliable data. Further, the present study employed triangulation technique to achieve consistency through the use of different statistical tools . The respondents were selected based on their involvement and prior experience in public infrastructure projects. A priori analysis was run to estimate the number of responses required for this study to specify the sample size by using the population proportion. With the assumptions of the confidence interval of 95% (Zα/2 = 1.96), the margin of error of 10% (ε = 0.10), and the limited amount of information regarding the resulting data distribution, the maximum proportion of respondents was used (p = 50%). Consequently, the expected sample size for the study was 96 subjects. In this regard, a total of 148 questionnaires were distributed and 106 responses were returned; representing 72% response rate. From these, 13 of the responses were incomplete, and the remaining 93 valid responses comply with the required sample size and were further considered for the analysis. The demographic summary of respondents is shown in Table 3.

Data analysis
In order to avoid bias by the respondents, the current study utilized triangulation method to achieve some measures of objectivity through the use of several statistical procedures. This technique has also long been emphasized by prior studies such as . In this respect, the study adopted a total of six common non-parametric statistical measures including, Cronbach's alpha and Kolmogorov-Smirnov test, Mean Score, Chi square test, Spearman's Rank Correlation test, and Factor Analysis.

Findings
This section discusses the analysis of data collected through questionnaire survey and presents the results of the statistical tools adopted in the current study. The responses were carefully analyzed using the statistical software package IBM SPSS V23, and the findings are illustrated in the following subsections.

Normality and reliability tests
The Kolmogorov-Smirnov test was used to test the normality of data. The test result indicated a non-normal distribution; so, non-parametric statistical tests will be conducted further.
Similarly, the Cronbach's alpha reliability test is employed to test the internal consistency of the questionnaire items. The larger the α-value, the higher the reliability. If the α-value ≥ 0.7, the measurement scale is considered to be reliable (Charef et al., 2019b). In the current study, a Cronbach's alpha of 0.702 for benefits and 0.736 for barriers of BIM adoption were recorded; and both are in the acceptable range.

Mean score ranking (Benefits)
Mean score (M) utilizes the average (mean) of survey responses which were filled using a 5-point Likert's scale. As shown in equation 1, M is calculated by averaging all responses in an item. M Where: f is the frequency of responses, and S is the score given to each attribute by a respondent from 1 to 5.
Based on the survey results of the rankings as shown in Table 4, the top three significant benefits of BIM adoption are: "Improved Communication Among Parties", "Early Multidisciplinary Coordination", and "Good Working Environment Among Professionals" with a mean score ranking (M) with value of 4.26, 4.01 and 3.83 respectively. Whereas, experts perceived that "Lesser Claims and Disputes" (M = 3.05), "Clash Detection" (M = 2.96), and "Better Quality Assurance" (M = 2.88) scored the lowest mean score values of BIM adoption benefits.
Most of the experts agreed that collaboration between the project team is a significant factor that affects the integration of technology innovation in projects. This integration could be achieved through regular meetings and communication among the project team. Prior studies also reported that the success of construction projects depends on the extent of flow of information and communication among professionals and stakeholders Ma et al., 2020). In contrast, the majority of respondents perceived that clash detection of BIM models and quality assurance issues might not be noteworthy in the current construction business environment. This arises from the fact that the Ethiopian construction industry is in the early stages of BIM implementation.

Analysis of agreement within the rankings of participant groups
The level of agreements or disagreements within the rankings of participants were analyzed using Kendall's coefficient of concordance (W). The range of values of Kendall's coefficient of concordance (W) is from 0 to 1. However, if the number of items that are going to ranked are larger than 7, chi square test will be used . W can be calculated using the following formula.

Where n = number of items to be ranked; R = average of ranked assigned to all items
Similarly, the chi-square values with degree of freedom (n-1) are calculated as follows:

Where k = number of respondents ranking the items; n = number of items to be ranked
The rule is that if the chi-square values of benefits and barriers of BIM adoption are larger than the critical value reading from the chi square significance level table and the given degrees of freedom (df) value, then the null hypothesis (Ho) will be rejected.
The null hypothesis (Ho) is: There is no relationship within the rankings of each participant groups.
The Kendall's coefficient of concordance (W) is computed to be, for all respondents (0.101), client (0.172), consultant (0.075), and contractor (0.132). Significant values for all group of respondents is calculated to be 0.000 which is less than the allowable significance level (0.05 or 5%). Correspondingly, the chi square values for all respondents, client, consultant, and contractor are 160.824, 49.529, 52.711, and 80.450 respectively. From the chi square table, the critical value of degree of freedom (df) = 16 and p = 0.05 is 26.30. Hence, since the calculated chi square values of all group of respondents are larger than the critical value, it can be concluded that there is indeed a relationship within rankings of each respondent group; and then the null hypothesis is rejected.

Analysis of agreement between participant groups
Spearman's rank correlation coefficient (r s ) was adopted to test the correlation between group of respondents on the sets of rankings. Normally, Spearman's rank correlation coefficient ranges from −1 to +1. The higher the positive/negative value of r s , the stronger positive/negative linear correlation (relationship). In contract, if r s = 0, there is no linear relationship between two sets of rankings at all . The rule is that if r s is statistically significant at a predetermined significance level (i.e. 5%), the null hypothesis (Ho) will be rejected.
The null hypothesis (Ho) in this is: There is no correlation between the sets of rankings among participant groups. r s can be computed using the following formula:

Where d = the difference between ranking of two groups in the same item; n = total number of responses for an item
The r s values for benefits of BIM adoption at the significant level of 0.05; a) between clients and contractor group, b) client and consultants, d) consultant and contractor are 0.696, 0.672, and 0.799 respectively. Similarly, the significant levels for the pair between client and contractor, client and consultant, and consultant, and contractor are 0.002, 0.003, and 0.000 respectively. All the calculated ρ values are less than the threshold value 0.05. Hence, the null hypothesis will be rejected. Which means that there is a significant correlation between client and contractor group, and client and consultant group on the overall ranking of BIM benefits in the Ethiopian public construction sector.

Mean score ranking (Barriers)
The barriers of BIM adoption in the public construction sector were computed using mean score. The result reveals that the top three ranked BIM adoption hindrances in the Ethiopian public construction sector are "Insufficient IT Infrastructure" with a value of mean M = 4.22, "Poor Government Support" M = 4.14, and "Lack of BIM Researches & Courses in Universities" with a mean score value of M = 3.99. In contrast, barriers such as, "Difficulty of Workflow Due to Change in Role" (M = 3.06), "BIM Model Ownership Rights" (M = 2.84), and "Complexity of BIM Software" (M = 2.78) had the lowest mean ranks, as shown in Table 5.
The result coincides with the findings of (Abubakar et al., 2014), which emphasized that internet and other related infrastructures and poor government initiatives to integrate BIM in the construction sector are the major hindrances of BIM implementation in the developing nations. This problem is even challenging when it comes to the East African region where poor infrastructure network hampers technology and innovation adoption in the construction industry.

Agreement of ranks within participant groups
After computation, the calculated values of Kendall's coefficient of concordance (W) are for all respondents (0.118), clients (0.103), consultants (0.098), and contractors (0.259). Significant values for all group of respondents is calculated to be 0.000, which is less than the allowable significance level 0.05.
Similarly, the chi square values were computed and the results for overall respondents, client, consultant, and contractor are 212.942, 35.079, 81.960, and 162.402 respectively. From chi square table, the critical value of degree of freedom (df) = 19 and p = 0.05 is 30.14; Hence, since the calculated chi square values of all groups of respondents are higher than the critical value, the null hypothesis is rejected.

Analysis of agreement between participant groups
The Spearman rank correlation coefficient (r s ) analysis for the barriers of BIM adoption reveals that the correlation between client and contractor group is r s = 0.548 with a corresponding significant level of 0.046. In which case, the null hypothesis is rejected. Similarly, between client and consultant group (r s = 0.723, α = 0.000), and contractor and consultant group (r s = 0.797, α = 0.000); the null hypothesis is rejected. Therefore, there is a correlation among all the pairs of respondent groups on the rankings of barriers of BIM adoption in the Ethiopian construction industry.

Principal component analysis
The current paper employed Principal Component Analysis (PCA), also known as factor analysis to examine and cluster the benefits and barriers of BIM adoption in the Ethiopian construction sector based on latent component factors. The principal component analysis findings for this study are discussed below.

BIM Benefits
In the case of BIM benefits, the PCA analysis converged to five latent components during the first round of varimax rotation. The result indicated that all the BIM adoption benefits had higher factor loadings when compared with the minimum value of 0.5. The model validity fitness was evaluated using the Kaiser-Meyer-Olkin (KMO) and Bartlett's tests. The result reveals that the KMO is 0.616, which is larger than the minimum acceptable limit of 0.6 (Olanrewaju et al., 2020). Similarly, the computed significance level of Bartlett's test is 0.000 with χ(93) is 619.769, which indicates the independence of the BIM benefit factors. Table 6 reveals five latent components which point to Project Management, Technical, Economic, Lifecycle, and Contractual Benefits.
The first identified BIM benefit component is Project Management. The factors associated with this component are: Improved Productivity, Effective Scheduling and Material Delivery, Lesser Claims and Disputes, and Better-Quality Assurance, with factor loadings of 0.867, 0.828, 0.699, and 0.540 respectively. All these BIM benefits focus on the advantages related to project success and delivery. Hence, the component is named, project management benefits. Shaaban and Nadeem (2015) reported the application of BIM in enhancing the overall productivity in the project life cycle of Qatari construction projects.  (0.600). As a business model, firms typically concentrate their effort in improving efficiency, reducing rework and risk, to get the utmost profit in the construction business environment. Thus, it's imperative to cluster these factors as economic related benefits.
In addition, the fourth identified component, Lifecycle benefits is comprised of factors such as Better and Effective Design (0.846),Enhanced Project Delivery (0.784),and Asset Management Benefits (0.768). These benefits are closely related to the project lifecycle aspect of the BIM process. Further, Allows Early Multidisciplinary Integration (0.863), Good working Environment Among Professionals (0.760), and Improved Communication b/n Parties (0.593) are associated with the fifth principal component, Contractual benefits. Prior studies reported the interoperability aspect of BIM and the benefit of early collaboration of design professionals and stakeholders through the use of various BIM models using Industry Foundation Class (IFC) platform (Azhar et al., 2012;Ghaffarianhoseini et al., 2017).

BIM Barriers
The PCA for the BIM barriers converged in two rounds of varimax rotation. During the first round, BBR2, 14, and 16 had factor loadings of below the threshold value of 0.5, and was discarded. Then, the second round of the PCA was conducted and showed a satisfactory result, with the KMO value of 0.7 and Bartlett's significant test result of 0.000 with χ(93) is 1042.004. As shown in Table 7, the final PCA result for BIM barriers comprised four principal components: Legal and Contractual, Process, Cultural and Organizational, and Government Related barriers.

Component 1-legal and contractual related barriers
Although the concise benefits and hindrances of BIM integration in organizational structures have been advocated in the AEC industry, it's imperative to evaluate the project-specific legal risks and uncertainties associated intuitive BIM implementation (Tan et al., 2019). As a technological collaborative process, the adoption BIM requires legal feasibility and contractual obligations among stakeholders. The Legal and Contractual Component in this study is comprised of four factors: Lack of a Standard Form of Contracts for BIM Adoption, Lack of BIM Regulations and Standards, Inclusion of BIM Protocols in Contracts, and Lack of Insurance Applicable to BIM Implementation; with factor loadings of 0.895, 0.879, 0.869, and 0.845 respectively. This component accounts for 26.48% of the total variance of BIM adoption barriers. This component aligns with previous findings such as (Gardezi et al., 2014) in Malaysia, (Arshad et al., 2019) in Pakistan, and (Amuda-Yusuf, 2018) in Nigeria. For instance, Gardezi et al. (2014) reported that lack of determination of ownership of the BIM model information, including model copyright protection laws and liability of the model data entry are the critical legal and contractual risks in the Malaysian construction sector. Whereas, Arshad et al. (2019) analyzed the legal aspect of BIM adoption with respect to the conventional project delivery method, Design-Bid-Build (DBB).
Moreover, studies that focused on developing countries, especially in the sub-Saharan African region demonstrated the limitation of BIM-related standards and guidelines to provide legal ground for BIM enabled projects across the construction sector (Olanrewaju et al., 2020). To reinforce this, Olatunji and Sher (2010) highlighted the legal implications arising from BIM implementation in construction projects and the need for contractual frameworks to accommodate those challenges. The authors reported that BIM-related legal insinuations are a major concern which slows down the adoption and diffusion process. Generally, it is important to note that most previous studies, including the present study agreed that in order to have a concise and all rounded standard form of contracts for a successful BIM adoption in developing countries, there has to be a collaborative effort between all major stakeholders across the industry.

Component 2-process related barriers
BIM is recognized as a technology-based process which needs the attention and understanding of practitioners to function smoothly. In this respect, all key stakeholders are responsible to harmonize the working environment for a successful project delivery. A closer look at these factors reveals that they are related to software application and integration themes. To reinforce the findings, (Olatunji & Sher, 2010) highlighted that although BIM software models and the overall process are associated with collaboration among stakeholders within a project, ownership of the final software output belongs to the owner rather than consulting firms individual ownership right of design models in the conventional delivery methods. This position is aimed at strengthening owner's rights and fostering collaboration amongst owner and project teams throughout the project lifecycle (Porwal & Hewage, 2013). Nevertheless, other studies disagree with this philosophy, and argued that this could result in certain unsatisfactory consequences to the owner, and this in turn is detrimental to the project itself (Arshad et al., 2019). Hence, it's eminent to develop clear and concise BIM-based procurement and contract liability guidelines prior to project commencement.

Component 3-cultural and organizational-related barriers
It's a well-known fact that having a smooth working environment and early stage coordination among major parties in construction projects leads to ultimate project success. This notion is the center focus strategy of BIM implementation in the construction sector. When it comes to the sub-Saharan African region (of which Ethiopia is situated), the private sector is more lean-to pertaining BIM adoption in construction projects. This "bottom-up" approach in the absence of government involvement tends to constrain the diffusion process across and pushes the implementation of BIM through inter-sectorial specific strategies (Kekana et al., 2020) This component is composed of five factors: BIM Misunderstanding (0.900), Lack of Awareness (0.895), Lack of Training for Professionals (0.743),Lack of BIM Expertise (0.715),and Resistance to Change (0.686). This component accounts for 13.686% of the total variance of BIM adoption barriers. Ahuja et al. (2020) in India, which is a developing country like Ethiopia, indicated that social and cultural barriers are prominent challenges which lead to low BIM implementation in the construction sector. Olanrewaju et al. (2020) further reinforced that findings by compounding the effect of low BIM awareness and misunderstanding on the level of BIM diffusion in Nigeria.
In addition, Shaikh et al., (2016) observed the lack of BIM expertise and professional's resistance to equip themselves with the BIM environment as critical factors that account for the failure of BIM in the Saudi Arabia construction sector.

Component 4-government related barriers
Literature summarized BIM as a digital data-based modeling, analysis and simulation process which requires the integration of information technology infrastructure to utilize the method in construction projects (Ahuja et al., 2020). However, the major challenges that hinder the adoption BIM in developing countries are often related to poor information technology infrastructure network and the lack of government initiative to provide sufficient internet access to the public (Abubakar et al., 2014). These challenges further highlight the government's role in low-income economies with regard to facilitating BIM adoption through infrastructure development.  (Olanrewaju et al., 2020); and (Abubakar et al., 2014) which revealed that the governments in developing countries play a vital role to emanate BIM adoption policies and guidelines which enables the environment for disseminating BIM knowledge to practitioners, as well as a successful implementation of BIM in AEC firms operating in those emerging markets (Bui et al., 2016).
In addition, Ismail et al. (2017) highlighted that government's initiative and mandate is a significant driver to encourage firms effectively accept, manage, and corroborate BIM adoption in construction practices. It is worth noting that, despite the problems envisaged in the Ethiopian construction sector, policy makers including agencies and the regulatory body collaboration with the private sector through PPP schemes and networks is a better alternative to encourage the implementation of BIM and tackle the identified adoption challenges.

Practical implications and recommendations
Based on the empirical findings, thoughtful practical implications and recommendations are highlighted for professionals, key stakeholders, policy makers and regulatory body. Understanding the potential benefits and challenges of BIM adoption in the Ethiopian construction sector will help practitioners to be in a better position to adopt BIM in public housing projects arising from the increased understanding of the BIM benefits and barriers. For instance, for the government, when it comes to public condominium housing and other public projects plays a vital role to achieve the second Growth and Transformation Plan (GTP). Hence, the results of this paper could be used by policy makers and the regulatory body to put more emphasis on creating a healthy environment to encourage the private sector to be informed about BIM.
Recently, the Ethiopian Project Management Institute (ECPMI, 2018) published a 5-year roadmap to improve the current BIM uptake, and encourage stakeholders to adopt BIM in public construction projects throughout the country. This roadmap acknowledges the adoption of BIM within the construction sector to enhance project delivery and improve the overall construction process. In this regard, the current study provided a set of comprehensive benefits and barriers of BIM adoption to demonstrate critical gaps and area of improvement for projects in the Ethiopian context. More so, the findings are believed to help local construction organizations to cope up with international firms operating in the Ethiopian public sector.
In addition, this study evaluated the relationship between the experts' ranking on the potential benefits and barriers of BIM adoption using Kendall's coefficient of concordance, and Spearman rank correlation. The result indicated that there is a good consensus among client. consultant, and contractor. The results coincide with the findings of Jin et al., 2017). This agreement and consensus between the stakeholders will pave the way for professionals, top management team and business CEOs to collaborate on BIM-based projects across the private and public sectors.
Further, the findings of the PCA offers comprehensive and empirical-based evidences that can be utilized to close underlying the gap regarding the critical challenges and barriers of BIM adoption in the Ethiopian context. This in turn will enable the experts in the construction sector to acquire sufficient awareness and common understanding in relation to BIM Adoption. Table 8 illustrates the key recommended actions highlighted in relation to the four critical BIM adoption barrier components in the Ethiopian construction sector.

Conclusion
The current study outlined the potential benefits and associated barriers of BIM adoption in projects from the international research community; and ranked their criticality based on different empirical techniques in the Ethiopian public construction sector. The paper also compared the empirical findings with studies in other developing regions to contextualize the results. Furthermore, the opinions of the different parties (owner, consultant, and contractor) were compared to investigate the discrepancy of their assessment.
Meanwhile, the PCA result found five latent BIM benefit components: Project Management, Technical, Economic, Lifecycle, Contractual Benefits; and four latent barrier components: Legal and Contractual, Process, Cultural and Organizational, and Government Related Barriers. Both findings reveal the relationship among certain factors and functionalities in the context of public construction projects as a contribution to the BIM body of knowledge. Similarly, the highlighted factors disclose the need for salient BIM adoption strategy to utilize the potential benefits and improve the major hinderances of BIM in the Ethiopian construction industry.
The findings of this study, for the first time provide empirical evidences of the potential benefits and barriers of BIM adoption in the context of the Ethiopian public construction sector. This paper also provides practical insights and key recommendations to tackle the aforementioned barriers and enhance the current BIM uptake in public infrastructure projects. More so, the principal component analysis and discussion reveals that BIM adoption in construction projects is context based. Hence, this study identifies the country-wide practice or culture so as to improve the statusquo and help major stakeholders with a basis in the establishment of BIM policies and guidelines.
The study has few limitations. (1) Although prior studies, including this study employed quantitative data analysis techniques, the authors believe that using qualitative measures could also ▪Devise financial support mechanisms, including loans to withstand the high cost of implementation ▪Encourage higher education institutions to include BIM related courses and research-based projects in curriculums provide additional perspectives on the subject matter; and (2) the study considered the generalized construction project concept to alleviate the systematic adoption of BIM in the Ethiopian construction sector. Such type of understanding is common in similar studies such as (Bosch-Sijtsema et al., 2019;Chan et al., 2019;Ma et al., 2020)), although the benefits and hindrances may differ according to the variability of projects. such as road, water, or residential. Further studies can be explored on BIM case studies and comparative evaluation of BIM strategies with regard to organizational basis and types of projects.