Аннотация:Conventional project delivery in the Architecture, Engineering, and Construction industry is plagued by: cost over-runs, delayed delivery, and poor quality control. Integrated Project Delivery (IPD) seeks to improve project outcomes by fostering collaboration among key stakeholders through shared risks and rewards as well as early and sustained engagement. The objective of this study is to identify the challenges in implementing IPD by drawing on 39 semi-structured interviews with owners, constructors and designers. 90+% of respondents reported challenges in: (1) sustaining a collaborative environment, (2) dealing with the operating environment, (3) selecting the right team, (4) embedding IPD concepts, and (5) making sound and timely decisions. These observations were insensitive to level of IPD experience. Detailed analysis of stakeholder experiences led to four key insights for improved implementation of IPD: (a) focus on partnership capability in IPD team selection; (b) empower IPD team members and establish a flatter organizational structure; (c) bridge the knowledge gap on IPD concepts and their implementation; and (d) establish a balance between efficient resource allocation and collaboration. More generally, this study shows that IPD will not succeed by principles alone. It requires cultural change in the AEC industry and rethinking project planning and management.