In the past decade the relationship between the client and contractor in the Dutch infrastructure sector has been disrupted. This disrupted relationship can mainly be characterised as adversarial and distrusting. Additionally, this has resulted in a growing number of disputes between the client and the contractor. As a result of the adversarial relationship and the high expenses to resolve the growing number of disputes, construction projects are more likely to face with time and cost overruns. Currently, the Dutch infrastructure sector is searching for possibilities to improve the client-contractor collaboration. In this study the client-contractor collaboration in ECI projects is compared to collaboration in D&C projects. To assess the client-contractor collaboration, the RECAP tool is used. The results of this research are evident. The client-contractor collaboration in ECI projects is better for all collaborative aspects.