An Investigation on Virtual Information Modeling Acceptance Based on Project Management Knowledge Areas

: In the contemporary construction management, poor project performance, cost overrun, and low-quality construction have become a central point of attention for improving project performance including information, interaction and communication management. Virtual design and building information modeling play indispensable role in improving the project performance. The aim of this study is to investigate the beneﬁts and challenges of Virtual Information Modeling as a novel information and communication technology method on project management knowledge areas in the construction industry. Using one-sample T test with Kolmogorov-Smirnov approach, we analyzed data collected from structured questionnaire survey involving project managers working at architecture, engineering and construction industries in Tehran, Iran. The results with 64% response rate suggest that the most important beneﬁts and challenges of using Virtual Information Modeling are related to the area of integration, and implementation of Virtual Information Modeling has signiﬁcant impact on project integration management knowledge in compare with other project management knowledge areas. Thus, integration should be considered a top priority for construction companies implementing Virtual Information Modeling in their projects. Policymakers should understand that careful management of virtual information is essential for improving the performance of projects and enhancing the process efﬁciency.


Introduction
Construction companies have been struggling to improve their information management, interactions and communications [1].Information and communication technology has potential to significantly reduce construction time and cost, defects, accidents, waste and operation and maintenance costs while improving predictability and productivity in construction companies [2].However, the majority of construction business processes are still heavily based on traditional means of communication such as face-to-face meetings and the exchange of paper documents in the form of technical drawings, specifications and site instructions.This is due to historical, industrial and market forces that perpetuate the industry's culture, affecting the adoption of IT in day-to-day business processes [1].
The research to date has tended to focus on improving project management methods and practices [3].Current trends in information and communication technology (ICT) are yielding a wide range of new computer-based tools to support the architecture, engineering, construction and facilities management (AEC) industries.These tools, particularly those associated with building information models (BIMs) for project modeling and integration promise great improvement in the effectiveness and efficiency of designing and managing construction projects.However, these improvements require more than just technical solutions; their full potential cannot be realized without corresponding changes in the work tasks and skill sets of the project participants [4].Information and communication have always been important to AEC projects; however, approaches for managing information have generally been informal and ad hoc [5].
Virtual design and construction was pioneered by research over the last two decades at the Center for Integrated Facility Engineering (CIFE) at Stanford University [6].The objective of virtual design construction is to use virtual models to simulate the complexities of construction project delivery, to understand the pitfalls project teams are likely to encounter, to analyze these pitfalls and to address them in a virtual world before any construction work takes place in the real world [7].
The adoption and implementation of virtual design and construction in the architecture, engineering and construction (AEC) industry has been growing in developed countries and has become an important strategy in the construction industry to improve productivity and profitability.Despite the many improvements and capabilities of virtual design and construction, it is still unfamiliar to the construction industry in Iran, and project managers still rely on traditional approaches.Over the past few years, some companies have been moving toward the use of new methods, but only use some of the capabilities.Construction companies in Iran are hesitant to accept and implement virtual design and construction approaches, since they are not familiar with this method, and project managers are still unaware of the benefits of implementing virtual design and construction.Therefore, the aim of this paper is to analyze the benefits and challenges of Virtual Information Modeling aligned with project management knowledge areas for AEC industry particularly for developing countries.An analysis of previous research show that Virtual Information Modeling (VIM) implementation by project managers in AEC industry particularly in developing countries like Iran is missed, in addition, far too little attention has been paid to the benefits and challenges of implementing VIM in regard to project management knowledge areas.There have been no empirical studies which compare differences in project management knowledge areas while implementing VIM.This research, therefore, intends to see the prioritization of project management knowledge areas considering the benefits and challenges of VIM implementation based on project managers' perspectives in AEC industry.The research to date has tended to focus on VIM implementation rather than project management knowledge areas prioritization for VIM implementation.
The paper is structured as follows.First, the VIM method is introduced briefly through a literature review.Then the benefits and challenges identified from the literature are categorized according to project management knowledge areas.Then, using a questionnaire distributed to employees in the AEC industry in Tehran province in Iran, the benefits and challenges of proposed VIM are investigated and prioritized based on their applicability's in AEC industry.

Terms and Concepts
Technology is generally defined as a technological solution in the context of construction industry.For example, it refers to tools, machines, and modifications to these tools that are used to achieve a project goal and perform a specific function or may resolve a problem in the context of the construction industry [8,9].Technology in construction generally embraces digital devices, spatial analysis systems, hand tools and excavation equipment and any combination of resources used in the process of construction operation from design to construction and demolition [10][11][12].In this paper, Virtual Information Modeling (VIM) refers to two widely used concepts in the construction literature: virtual design and construction and building information modeling.
The Center for Integrated Facility Engineering (CIFE) defines virtual design and construction as the use of multi-disciplinary performance models covering design to construction, including the facilities, work processes and organization of the design and construction teams in order to support the construction project objectives.This concept allows a construction practitioner to build symbolic models of the building, design organization and the design or construction processes early before a large commitment to the client is made.Thus this supports mainly design and construction managers in terms of the description, evaluation, prediction and decisions about a project's scope, organization and schedule with virtual methods [7].
A three-stage maturity model of development has been suggested for VIM by Khanzode, Fischer et al. [7]: (i) The first stage is visualization which was illustrated by using two-dimensional (2D) approaches such as CPM (Critical Path Method) and bar charts.The aim of visualization is to represent design and rehearse construction processes through visual simulation, three-dimensional (3D) technologies and virtual reality; (ii) The second stage of VIM is integration which aims to integrate various processes and different disciplines involved in a project; (iii) The third stage of VIM is automation which aims to automate some of the tasks in the design and construction processes.Currently, design and construction planning are creative work undertaken exclusively by humans; VIM provides a good platform for this work [7].
As defined in National BIM Standard (NBIMS) issued by building SMART alliance ® defines BIM as "a digital representation of physical and functional characteristics of a facility" [13].Building Information Modeling was utilized by practitioners as a significant opportunity in the architecture, engineering and construction industry.It is an emerging concept which is known as a solution to facilitate the integration and management of information throughout the building life cycle.Previous studies presented several case studies and applications of this technology [14][15][16].
The scope of the definition of virtual design and construction is broader than that of building information modeling, but both concepts give us a comprehensive view of utilizing a new technology for both design and construction at different levels of office and project.The building information modeling concept tends to cluster around a 3D model and visualize the technical aspects of a project, virtual design and construction encompasses multi-disciplinary use of the models and social methods for achieving the project goals.The virtual design and construction also stresses the loop between defining objectives and rendering solutions with optimization and automation.Hence while building information modeling and virtual design and construction share similar characteristics, there are subtle additions to virtual design and construction in regard to the scope of modeling, the drivers of modeling, and social methods for leveraging those models, making it more comprehensive and holistic than building information modeling.However, since many entities and individual projects across the industry set forth their own definition of building information modeling, some may argue that building information modeling also includes these additional characteristics.With this understanding in mind, i.e., with a broader definition of building information modeling that matches virtual design and construction, both concepts the virtual design and construction and building information modeling, namely VIM can be represent all relevant technologies in construction [17].
While previous concepts pointed out to the technology itself, and the applications, they did not give an insight into the process of the technology acceptance in a specific context.According to Rogers [18], technology acceptance is defined as a series of steps taken in the technology utilization process.In this process, a technology user passes through the process results in accepting or rejecting the utilization of the VIM technology.Sepasgozar et al. [19] classifies the technology adoption into three major clusters from different perspectives: (i) Socio-economic perspective [20]; (ii) managerial perspective [8]; and (iii) psychological perspective [21,22].Studies that take a socio-economic perspective such as Rogers [18] focused on profiling the users of particular technologies in different disciplines.Rogers [20] suggested that technology acceptance occurs within a social system, where potential adopters communicate with each other based on a variety of attitudes towards technology utilization.Roger's formative model includes five groups of technology adopters: innovators; early adopters; early majority adopters; late majority adopters; and laggards.The key concept of this theory relies on the concept of innovation relative to individual behavior, their relationships in a social context, and communication.Research in construction adopted the concepts and applied them in a way similar to other industries.
While there is some attempt to identify the barriers of technology adoption, the construction industry continues to lag in utilizing new technologies, and is generally adverse to change as discussed by Nicolini [23]; Bowden et al. [2]; Nikas et al. [24]; Harty [25]; Sepasgozar et al. [26], Milliou and Petrakis [27].The Melbourne Institute of Applied Economics and Social Research [28] indicates that the construction technology index is significantly lower than any other industries.This index had a large fell by 18.2% between 2005 and 2006.For example, Hinsch et al. [29] studied on photovoltaic modules in Fraunhofer Institute for Solar Energy Systems (ISE) and reported that the Dye Solar Cells (DSC) is investigated as a new technology since 15 years.Hinsch [30] wondered why only a small portion of the photovoltaic modules was adopted by builders in construction market so far, when the photovoltaic application has a strong market in overall.Cleveland [31] identified a group of emerging technologies that may enable construction projects and support construction operation in the field.However, he concluded that there are significant barriers to be investigated and challenges to be addressed and several hurdles to overcome for adoption.The adverseness to risk and the technology acceptance lag is due to many reasons such as the stakeholders expectations and communication, variability of a project's expertise, the uniqueness of the technology [32] and the nature of industry itself [33] e.g., in developing country.These reasons make the construction industry very different compared to other industries.This is extradited since the technology acceptance and utilization processes in construction is not clearly understood, while they are mature streams in other disciplines such as Information System (see: Vessey et al. [34]; Venkatesh et al. [35]).
The main concept of technology acceptance goes back to decades ago when Howard and Moore ( [36], p. 34) found that the technology users' path to a utilization decision consists of a series of mental or behavioral steps that potential adopters pass through.This might be coupled with organizational factors when we analyze the adoption process including benefits and challenges at the project level.Here, Adoption description reveals the necessary steps to introduce a product into the daily operations of an organization [37].A well-known psychological model of Theory of Reasoned Action (TRA) developed by Ajzen and Fishbein [38] is concerned with the indicators of conscious intention and users attitude towards a behavior.
Davis et al. [21] developed their model based on the Theory of Reasoned Action, namely technology acceptance model including two main contracts presented in Figure 1.These constructions are useful to predict individual behavior applied to the field of VIM technology.Sepasgozar et al. [19] analyzed technology acceptance model, as a predictor of the an information technology acceptance.The main constructions are usefulness and ease of use.
context, and communication.Research in construction adopted the concepts and applied them in a way similar to other industries.
While there is some attempt to identify the barriers of technology adoption, the construction industry continues to lag in utilizing new technologies, and is generally adverse to change as discussed by Nicolini [23]; Bowden et al. [2]; Nikas et al. [24]; Harty [25]; Sepasgozar et al. [26], Milliou and Petrakis [27].The Melbourne Institute of Applied Economics and Social Research [28] indicates that the construction technology index is significantly lower than any other industries.This index had a large fell by 18.2% between 2005 and 2006.For example, Hinsch et al. [29] studied on photovoltaic modules in Fraunhofer Institute for Solar Energy Systems (ISE) and reported that the Dye Solar Cells (DSC) is investigated as a new technology since 15 years.Hinsch [30] wondered why only a small portion of the photovoltaic modules was adopted by builders in construction market so far, when the photovoltaic application has a strong market in overall.Cleveland [31] identified a group of emerging technologies that may enable construction projects and support construction operation in the field.However, he concluded that there are significant barriers to be investigated and challenges to be addressed and several hurdles to overcome for adoption.The adverseness to risk and the technology acceptance lag is due to many reasons such as the stakeholders expectations and communication, variability of a project's expertise, the uniqueness of the technology [32] and the nature of industry itself [33] e.g., in developing country.These reasons make the construction industry very different compared to other industries.This is extradited since the technology acceptance and utilization processes in construction is not clearly understood, while they are mature streams in other disciplines such as Information System (see: Vessey et al. [34]; Venkatesh et al. [35]).
The main concept of technology acceptance goes back to decades ago when Howard and Moore ( [36], p. 34) found that the technology users' path to a utilization decision consists of a series of mental or behavioral steps that potential adopters pass through.This might be coupled with organizational factors when we analyze the adoption process including benefits and challenges at the project level.Here, Adoption description reveals the necessary steps to introduce a product into the daily operations of an organization [37].A well-known psychological model of Theory of Reasoned Action (TRA) developed by Ajzen and Fishbein [38] is concerned with the indicators of conscious intention and users attitude towards a behavior.
Davis et al. [21] developed their model based on the Theory of Reasoned Action, namely technology acceptance model including two main contracts presented in Figure 1.These constructions are useful to predict individual behavior applied to the field of VIM technology.Sepasgozar et al. [19] analyzed technology acceptance model, as a predictor of the an information technology acceptance.The main constructions are usefulness and ease of use.

The Gap of Understanding Construction Technology Adopters at Organizational Level
The literature ignored to continue investigating the barriers and drivers of technology acceptance mainly VIM in developing countries.Since we understate the subjectivity of the barriers as perceived by their participants, it is no surprise that they overlooked some fundamental factors relevant to the context including developing countries in the literature of innovation adoption.The innovation diffusion literature [18] emphasize that (a) technology acceptance is based the perception that the VIM meets (or fails to meet) a desired level of utilization; and then (b) the process of reducing the uncertainty of the perceived acceptance of VIM is largely depends on individuals interactions in a project or organization, which is a peer to peer process.This concept poorly understood in the literature.For example, Rahman's [39] deduction that a policy intervention may give a better

The Gap of Understanding Construction Technology Adopters at Organizational Level
The literature ignored to continue investigating the barriers and drivers of technology acceptance mainly VIM in developing countries.Since we understate the subjectivity of the barriers as perceived by their participants, it is no surprise that they overlooked some fundamental factors relevant to the context including developing countries in the literature of innovation adoption.The innovation diffusion literature [18] emphasize that (a) technology acceptance is based the perception that the VIM meets (or fails to meet) a desired level of utilization; and then (b) the process of reducing the uncertainty of the perceived acceptance of VIM is largely depends on individuals interactions in a project or organization, which is a peer to peer process.This concept poorly understood in the literature.For example, Rahman's [39] deduction that a policy intervention may give a better information dissemination about the benefits of modern methods in construction is valuable.However, as mentioned above, they omitted the fact that some companies may be the wrong target market for such a policy, and also overlooked the fact that many of the relevant stakeholders already communicate with each other via site visits and social media, and exhibitions.
In order to extend the body of knowledge, it is essential to consider previous scientific investigations in the field of technology adoption.The paper by Rahman [39] demonstrates how neglecting established work in the innovation literature may lead to significant confusion.According to Rahman [39], the technology acceptance model can be seen as a series of stages in the utilizing process through which the technology user passes.
The OECD reports [40] indicate that the construction industry is one of the highest of almost 30 industries in terms of its sourcing modules from intermediaries.Sepasgozar et al. [41] carefully examined the literature and points to the poor understanding of the technology adoption process in the construction literature.For example, Rahman [39] contextualizes a claim of low modern methods in construction uptake by identifying that 7% of low rise multifamily homes are built by using modern methods in construction, the author also identifies that modern methods in construction are inappropriate for small scale projects, because of (a) the high overhead costs of utilizing a modern method and (b) the high cost per unit when quantities of technology applications is low.If the adoption of modern methods in construction is not beneficial for small companies.Therefore, promoting a new technology and its application and benefits to them may actually be counterproductive and contribute to technology failure or the company failure.Figure 2 categorizes factors derived from the literature which will be used for developing the criteria for identifying VIM benefits and challenges.
Buildings 2018, 8, x FOR PEER REVIEW 5 of 17 information dissemination about the benefits of modern methods in construction is valuable.However, as mentioned above, they omitted the fact that some companies may be the wrong target market for such a policy, and also overlooked the fact that many of the relevant stakeholders already communicate with each other via site visits and social media, and exhibitions.
In order to extend the body of knowledge, it is essential to consider previous scientific investigations in the field of technology adoption.The paper by Rahman [39] demonstrates how neglecting established work in the innovation literature may lead to significant confusion.According to Rahman [39], the technology acceptance model can be seen as a series of stages in the utilizing process through which the technology user passes.
The OECD reports [40] indicate that the construction industry is one of the highest of almost 30 industries in terms of its sourcing modules from intermediaries.Sepasgozar et al. [41] carefully examined the literature and points to the poor understanding of the technology adoption process in the construction literature.For example, Rahman [39] contextualizes a claim of low modern methods in construction uptake by identifying that 7% of low rise multifamily homes are built by using modern methods in construction, the author also identifies that modern methods in construction are inappropriate for small scale projects, because of (a) the high overhead costs of utilizing a modern method and (b) the high cost per unit when quantities of technology applications is low.If the adoption of modern methods in construction is not beneficial for small companies.Therefore, promoting a new technology and its application and benefits to them may actually be counterproductive and contribute to technology failure or the company failure.Figure 2 categorizes factors derived from the literature which will be used for developing the criteria for identifying VIM benefits and challenges.Existing research in construction has considered the financial aspects of technology selection using conventional investment justification, and the implementation and evaluation of particular technologies [42,43].Whereas many typologies of adoption have been ignored such as process innovation, and barriers of technological administrative innovations.In addition, stakeholders and individuals, specifically technological gatekeepers, who attempt to find and get aware from a new technology, have important roles and may significantly influence the adoption.Scholars such as Slaughter [44]; Stewart and Tatum [45] investigated several innovations, and they pointed that innovators such as idea generator who face to a challenge in a construction project also may significantly influence the technology adoption, and can be a gatekeeper, e.g., an innovative designer in a contractor organization.A summary of benefits of implementing the virtual design and construction approach are classified according to nine areas of project management knowledge [46] are shown if Table 1.
A summary of challenges of implementing the VIM are classified according to several areas of project management knowledge [46] are shown in Table 2. Existing research in construction has considered the financial aspects of technology selection using conventional investment justification, and the implementation and evaluation of particular technologies [42,43].Whereas many typologies of adoption have been ignored such as process innovation, and barriers of technological administrative innovations.In addition, stakeholders and individuals, specifically technological gatekeepers, who attempt to find and get aware from a new technology, have important roles and may significantly influence the adoption.Scholars such as Slaughter [44]; Stewart and Tatum [45] investigated several innovations, and they pointed that innovators such as idea generator who face to a challenge in a construction project also may significantly influence the technology adoption, and can be a gatekeeper, e.g., an innovative designer in a contractor organization.A summary of benefits of implementing the virtual design and construction approach are classified according to nine areas of project management knowledge [46] are shown if Table 1.Note: Items refer to the Project Management Knowledge Areas [46].
A summary of challenges of implementing the VIM are classified according to several areas of project management knowledge [46] are shown in Table 2.

Integration
Need for multi-party collaboration contracts [6,52] Need to change processes of project organization Lack of software compatibility from one project to another [3] Time Creating all models at the optimum level of detail and accuracy and reducing design speed [3] Cost Excessive cost of software and hardware tools [6,52] Controversy over who should pay for VIM [3] Creating training and learning costs

Stakeholder
The need for all stakeholders to agree on standards for exchange between different models [6,52] Human Resource Need for a high level of expertise [53] Risk The existence of innovative processes and the risk of change [3,[54][55][56] Note: Items refer to the Project Management Knowledge Areas [46].
Tables 1 and 2 present that scholars have conducted research to come up with the benefits and challenges of VIM implementation in AEC industry considering project management knowledge areas [3,4].The issue of prioritization of project management knowledge areas for benefits and challenges of VIM implementation is still controversial and to date there is little agreement on what project management knowledge areas need to be focused more in compare with other areas for maximizing the benefits and minimizing the challenges of VIM implementation.No research has been found to prioritize the benefits and challenges of VIM implementation based on project management knowledge areas.

Materials and Methods
The construction industry of Tehran Province is divided into two main sectors.The first is government infrastructure projects and the second is the housing industry.In recent years, the construction industry has been thriving due to an increase in national and international investment to the extent that it is now the largest in the Middle East region.The purpose of this research is to study the benefits and challenges of applying virtual information modeling in construction projects in Tehran, Iran based on project management knowledge areas.This research recognizes the benefits and challenges of applying VIM in projects, and classifies them according to areas of project management knowledge, in order to specify the significance of the benefits and challenges in project success.
The variables of the study are the variables which are identified for investigating the benefits and challenges of applying VIM in projects which contain specified indicators in each of ten areas of project management knowledge: integration, time, cost, communications, quality, stakeholder, human resource, procurement, risk and scope (Snyder 2014).The research hypothesis is "the identified benefits and challenges in each of the ten areas of project management knowledge influence the successful completion of a project".
This study used a survey research design because it provides a relatively quick and better method of collecting information from targeted samples and addressing research objectives.Collecting VIM data is a time-consuming process, and all data has not been recorded; thus, a questionnaire is a quick way of collecting data and it is an appropriate tool for empirical research and can generalize findings by testing the hypotheses.The sample population for the research was employees in the AEC industry in Tehran province in Iran who are familiar with VIM and are likely to apply it in their organization's projects.A survey was comprised of tailored measurement scales with 30 questions pertinent to VIM benefits and 10 questions related to challenges of VIM application in projects, based on the literature review results were classified into ten areas of project management knowledge.The survey response rate was 64%.Table 3 presents the summary of respondents' profile.

Results of the Structured Survey
Content validity was used to evaluate the survey validity.The draft survey was discussed by professors and specialists in this field and after the recommended changes were made, the final survey was prepared.To evaluate the reliability of the survey, Cronbach's Alpha Test was used in SPSS software.The acceptable coefficient in this test is 0.7 and as the Cronbach's Alpha is closer to one, the questionnaire will have a better reliability [57].Table 4 shows the results.To specify the way data has been distributed, the inferential statistics method was used through the Kolmogorov-Smirnov Test in IBM SPSS Statistics 24 software (IBM Corp. Released 2016.IBM SPSS Statistics for Windows, Version 24.0.Armonk, NY: IBM Corp.).A One-Sample T Test was used for confirmation or rejection of the benefits and challenges of applying VIM which were identified in the literature review.The Friedman Test was used to study the equality or inequality of the significance of benefits and challenges of VIM application through the One-Sample T Test.

Friedman Test for Prioritizing the Benefits of VIM Application
The Friedman Test was used to prioritize the benefits of VIM which were confirmed in the One-Sample T Test.The results for this test are shown in Tables 7 and 8. Table 7 indicates that the significance level is zero and it is less than the level of alpha error 0.05, so the null hypothesis of "having equal importance among the benefits of applying VIM in successful completion of the project" is rejected and the alternative hypothesis of "differing importance of the benefits of applying VIM in successful completion of the project" is confirmed.Table 8 indicates that the average rating and the priority of 27 benefits in applying VIM influence the successful completion of projects.The most important benefits of applying VIM are "Achieve integrity and interactivity in business structures" with average rank of 19.58, "Optimize efficiency during all phases of the project" with average rank of 18.78 and "Achieve short timetables and improve effect on project time" with average rank of 18.55.The least important benefits are "Reduce complicated bureaucracies and solve problems more easily" with rank of 7.52, "Increase flexibility" with rank of 7.50 and "Facilitate resource management" with rank of 6.62.

One-Sample T Test for Analysis of the Challenges of VIM Application
The results of statistical analysis for each challenge of VIM application are presented in Table 9 according to the areas of project management knowledge.The Friedman Test was used to prioritize the challenges of applying VIM which were confirmed in the One-Sample T Test.The results are shown in Tables 10 and 11.Need for multi-party collaboration contracts 3.86 5 The existence of innovative processes and the risk of change 3.66 6 Controversy over who should pay for VIM 1.97 7 Table 10 indicates that the significance level is zero and it is less than the level of alpha error 0.05, so the null hypothesis is rejected and the alternative hypothesis of "differing importance of the challenges of applying VIM in successful completion of the project" is confirmed.
Table 11 shows the priority of seven challenges in applying VIM which affect successful completion of a project.The three greatest challenges are "Need to change processes of project organization" with average rate of 4.81, "Need for a high level of expertise" with average rate of 4.77 and "Creating all models at the optimum level of detail and accuracy and reducing design speed" with average rate of 4.52.The least important challenge is "Controversy over who should pay for VIM" with average rank of 1.97.

Discussions
The objective of the research was to investigate the benefits and challenges of applying virtual design and construction in projects and prioritize them based on project management knowledge areas.Through a literature review, the benefits and challenges were identified and a survey of 32 construction industry employees in Iran was used to confirm these benefits and challenges through statistical analysis.The 27 confirmed benefits of using VIM are presented in Table 12, by area of relevant project management knowledge and their priority.Table 12 shows the benefits associated with the area of project integration management have higher priorities than other areas.The three main benefits of VIM are:

•
Achieve integrity and interactivity in business structures;

•
Optimize efficiency during all phases of the project; • Achieve fast tacking approach and improve project schedule management plan.
Table 13 shows the seven challenges of adopting the virtual design and construction method by the area of project management knowledge and their priorities.Just as the most important benefits of VIM are associated with the area of integration management, the greatest challenges posed by VIM are also related to this area.This indicates the importance of VIM in creating greater integration and also creating challenges, which highlights the need for efficient management in this area.The three main challenges of VIM are:

•
Need to change processes of project organization as the project team will not be ready for changes.

•
Need for a high level of expertise in VIM; this is not a new finding.All other papers about BIM saying the same thing.

•
Detailed design must be accurate and optimal, and it needs to be complete in a shorter time.
Prioritization of project management knowledge areas regarding VIM benefits and challenges in AEC industry is one of the novelties of this research that can further contribute to the implementation of VIM in project management knowledge areas.This study found that integrating scope, time and cost are the most challenging section of VIM implementation for project managers in AEC industry.Although this study was conducted in Iran, it is generalizable to other regions and countries as well.

Conclusions and Recommendations
The results show that while VIM creates the greatest benefit in the area of project integration management, the greatest challenges are also in this area.VIM can support in a collection of processes required to ensure that the various elements of the projects are properly coordinated.VIM involves making trade-offs among competing objectives and alternatives to meet or exceed stakeholder needs and expectations.This highlights the importance of attention to all aspects of the use of VIM, specifically integration, and shows that even after the implementation of VIM the result is not always positive.The restrictions on data collection were imposed not only to maintain their privacy and sensitivity, but also because not enough project managers had implemented VIM in construction industry.Nevertheless, 32 usable survey responses, representing a 64% response rate, were collected, which was very rewarding considering the lack of such data in VIM and project management.
In this research, the benefits and challenges of using virtual information modeling in construction projects were identified, based on the area of project management knowledge areas were categorized and then prioritized according to a survey among the people working in construction industry of Iran and being familiar with the concept of VIM.Although the respondents' understanding of the VIM concept were high, the benefits and challenges of implementing VIM was not clear enough.Based on our findings, we realized that they have not understood the integration of the project management knowledge areas and project managers in AEC industry need to be trained for the project management integration knowledge areas in using VIM.
While the benefits and challenges of using VIM for all areas of project management knowledge areas were considered simultaneously in the research, future research could investigate the benefits and challenges using a larger sample and from other countries and separately for each of the ten areas of project management knowledge.Additionally, as the society of people using basic functions of VIM in their projects is gradually expanding, this survey can be conducted in a larger society.

Figure 2 .
Figure 2. Fishbone framework of the influential factors in Virtual Information Modeling (VIM) adoption decision.

Figure 2 .
Figure 2. Fishbone framework of the influential factors in Virtual Information Modeling (VIM) adoption decision.

Table 1 .
Benefits of VIM Application.

Table 2 .
Challenges of VIM Application.

Table 3 .
Summary of respondents' profile.

Table 6 .
Results of one-sample T-test for the evaluation of benefits.

Table 7 .
Test s of Friedman test for prioritization of benefits of VIM.

Table 8 .
Average rating of benefits of VIM among the confirmed benefits.

Table 9 .
One-Sample T Test Results for Evaluation of Challenges of VIM Application.

Table 10 .
Test statistics of Friedman test for prioritization of challenges of VIM application.

Table 11 .
Average rating of challenges of VIM application among confirmed challenges.

Table 12 .
Ranks of benefits of VIM application.

Table 13 .
Ranks of challenges of VIM application.