Fyhn, Håkon and Andersen, Lars (2019). “Team-leader walk as interdisciplinary communication tool at the building site.” In: Proc. 27 th Annual Conference of the International. Group for Lean Construction (IGLC), Pasquire C. and Hamzeh F.R. (ed.), Dublin, Ireland, pp. xx–xx. TEAM-LEADER WALK AS INTERDICIPLINARY COMUNICATION TOOL AT THE BUILDING SITE Håkon Fyhn 1 and Lars Andersen 2 ABSTRACT This paper introduces the concept of ‘team-leader walk’ as part of the construction process organized through TAKT production. The purpose of the team-leader walk, is to help team- leaders see, communicate and plan further ahead in the construction process. By systematically walking through the different zones of the building under construction, while discussing plans and coordination issues one to three weeks ahead, the building site is used as communication tool in the interdisciplinary communication between the team- leaders. Appealing to the often-well-developed practical intelligence of the team-leaders, we argue that the building site itself, enhances the ability to look ahead better than visualisation tools alone. The team-leaders, as last planners become better equipped to take part in the continuous planning. A condition for the team-leader walk, as presented here, is that the construction is organised according to a systematic movement in time and space – such as TAKT production. The study is based on observations and interviews at two building projects where the team-leader walk was tested in 2018. While the validity is limited by the number of cases, the building company in study find the results so promising they have decided to implement the team-leader walk in further building projects. KEYWORDS Lean construction, team-leader walk, last planner, TAKT INTRODUCTION A core idea in the last planner system is to engage those who actually do the job in the planning of it (Ballard 2000). This implies involving builders and team-leaders in the planning process. In particular the team leaders play an essential role in planning and coordinating the activities at the production front of the building site. In the present case study of two building projects lead by the same entrepreneur, the team-leaders engage in planning activities organised in a system similar to the last planner system, called Involved Planning (IP). 1 Senior Researcher, NTNU Social Research, Trondheim Norway, hakon.fyhn@ntnu.no 2 Research Professor, NTNU Social Research, Trondheim Norway