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Successful implementation of the lean concept as a sustainable approach in the construction industry requires the identification of critical drivers in lean construction. Despite this significance, the number of in-depth studies toward understanding the considerable drivers of lean construction implementation is quite limited. There is also a shortage of methodologies for identifying key drivers. To address these challenges, this paper presents a list of all essential drivers within three aspects of sustainability (social, economic, and environmental) and proposes a novel methodology to rank the drivers and identify the key drivers for successful and sustainable lean construction implementation. In this regard, the entropy weighted Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) was employed in this research. Subsequently, an empirical study was conducted within the Malaysian construction industry to demonstrate the proposed method. Moreover, sensitivity analysis and comparison with the existing method were engaged to validate the stability and accuracy of the achieved results. The significant results obtained in this study are as follows: presenting, verifying and ranking of 63 important drivers; identifying 22 key drivers; proposing an MCDM model of key drivers. The outcomes show that the proposed method in this study is an effective and accurate tool that could help managers make better decisions.

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The pressure of modernization and urbanization stimulated positive growth in Oman's construction industry especially in infrastructure development. The slower pace of construction progress in the past provides huge opportunity for the green concept to be integrated in tandem with the country's growth. The lack of evidence on green construction progress in Oman suggests that this concept is not yet at the forefront of the construction industry agenda. Proactive actions from the government, private companies and professional bodies are crucial to bring 'greener' change to the industry. Through surveys, this paper discusses the drivers to motivate construction practitioners to participate in implementing green concept into their construction projects and explore the perceptions of these practitioners on the future outlook of green concept in Oman. The motivating factors are categorized into 4: finance, knowledge and awareness, business strategy and ethics. The future scenario can be seen from two perspectives: promising outlook and status quo. This study sheds light on the status of green construction in Oman to enable further recommendations be made to improve and promote wider application in the future.