Building information modeling (BIM) offers various deterministic and uncertain benefits and costs. Although there are similarities between such costs and benefits in developed and developing countries, these factors should be analyzed carefully for each region/country due to differences in economic and technical status as well as available policies and regulations. Numerous studies have demonstrated the benefits and shortcomings of BIM adoption around the globe; however, there is scarce comprehensive research focusing on Iran with unique financial circumstances. The aim of this research is to investigate the benefits, opportunities, costs and risks (BOCRs) offered by BIM implementation in Iran as a developing country with high potential in but less adoption of BIM in construction projects. After identifying the BOCRs of BIM adoption from the literature, the Interval-Valued Fuzzy Delphi Method was used to identify the BOCRs while a novel multi-criteria decision-making approach (i.e., fuzzy parsimonious analytic hierarchy process) was employed to analyze BOCRs, respectively. The results showed that 4 out of 46 BOCRs gathered from the literature were not significant for Iran and should be omitted from further analysis, while one cost factor was added to the list. Also, it was revealed that “Facilitates project communication among stakeholders”, “Integrating life-cycle assessment dimensions to the decision-making process”, “Cost/efforts required to personnel training” and “Lack of national standard, procedures and guidelines” were the most significant BOCRs, respectively. These findings contributed to filling the research gap in BIM adoption in Iran using a novel methodology that provides deep insights into BIM adoption for practitioners and can be used as a basis for developing theoretical and conceptual research frameworks. The findings of this study are built upon the opinions of experts within the context of Iran and should be considered as a snapshot of the BOCRs of the adoption of BIM in Iranian construction projects while these are not futureproofed.

Green roofs (GRs) offer several environmental, social, and economic benefits while numerous barriers are limiting their adoption. This study covers two gaps in the literature: first, the lack of indicating separate hindrances to different types of GRs; second, the dearth of research related to the hindrances on GR adoption in any climate of Iran. This research aims to identify and analyze the importance of hindrances to GR adoption by considering the two major types of GRs using the Fuzzy Delphi Method (FDM) and Fuzzy Analytic Network Process (FANP), respectively. The results indicated that eight out of twenty-five identified hindrances to GR adoption were rejected using FDM. Moreover, it was found that although financial hindrances are significant for both types of GRs, public awareness is the most important hindrance to extensive GR adoption. As the first research of its kind in a semi-arid climate of Iran, the findings of this research provide an insight for the researchers and policymakers regarding the hindrances to GR adoption for further research and action.

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