This study contributes to the field by presenting one of the first studies in its kind focusing on CSFs for integration of sustainability into project management practices for construction projects within the context of developing countries. The model was validated through a survey returning 101 completed questionnaires with partial least squares structural equation modelling (PLS-SEM) as the method of analysis. These were customised for the context of developing countries by conducting 16 semi-structured interviews and were presented in form of a conceptual model. Having innovation diffusion theory as the theoretical point of departure, CSFs pertaining to the triple bottom line of sustainability (environmental, social and economic) were identified through a comprehensive review of literature. Reza Hosseini b, Hamed Golizadeh c, Shankar Sankaran d aĭepartment of Building and Construction Management, University of Canberra, Bruce, ACT, Australia b School of Architecture and Built Environment, Deakin University, Geelong, VIC, Australia Department of Construction and Project Management, Queensland University of Technology (QUT), Brisbane, QLD, Australia d School of Built Environment, University of Technology Sydney (UTS), Ultimo, NSW, Australia Received 17 March 2016 received in revised form 17 January 2017 accepted 18 January 2017 Available online 2 February 2017Ībstract This study looks at the critical success factors (CSFs) affecting integration of sustainability into project management practices of construction projects in developing countries. Available online at ScienceDirect International Journal of Project Management 35 (2017) 1103 – 1119 Critical success factors (CSFs) for integration of sustainability into construction project management practices in developing countries Saeed Banihashemi a,⁎, M.