Better collaboration in the construction industry might lead to a more efficient construction process and a high reduction of failure costs. A model that tries to support collaboration, is a Bouwteam. In a Bouwteam, the contractor is already involved in the design process and shares his knowledge about the realization costs of the design and its execution. This makes it possible to design more cost-consciously and reduces the chance of adjustments during the execution. Although a Bouwteam offers many advantages, practice shows that collaboration within this model can still be improved. Several researches have been conducted about the collaboration in the Bouwteam phase, where client and contractor work together. However, no research has been done about the phase thereafter, the transition from the Bouwteam phase into the execution phase. Therefore, this research focuses on how client-contractor collaboration can be improved during the transition from the Bouwteam phase into the execution phase in a Bouwteam project.