This paper discusses the critical factors for managing teams for integrated design and delivery solutions (IDDS), which aims to involve BIM tools, processes and skills across different stakeholders such as architects, consultants, contractors, and suppliers through the project lifecycle. Since IDDS is a recent development, the associated teamwork factors and challenges in implementation are not currently well understood. This paper reports the findings from a research that investigates this gap and forms the basis for future research directions. The findings reported in this paper are based on focus group interviews with representatives from leading organizations in the Australian and Finnish construction sector. The critical factors for an IDDS team are examined and discussed using the construct of mental models. In particular, this research investigates the critical task, process, context, and competence factors specific to the IDDS teams.