This study investigates the effects of the first phase of the Dutch two phase process project delivery method design on the information risk, the client-contractor relationship and risk allocation between client and contractor. The two phase process is a collaborative project delivery method which is used for infrastructure projects with the objective to reduce information risk and stimulate cooperation between client and contractor. As this project delivery method is new, knowledge on the effects of the use of this project delivery method is limited. Using desk and case study research with semi-structured interviews and an organisational behavioural theoretical lens, this exploratory research shows that the first phase of the two phase process project delivery method reduces the information risk, can make good cooperation between client and contractor possible and may help risk allocation between client and contractor. This study recommends public clients to think about the use of a two phase process project delivery method design carefully and incorporate mechanisms to end the first phase.