The research in this thesis is about the Aronsohn contracting vision, an innovative contract form developed by Aronsohn management. After successfully applying the method on a number of projects they were interested in a more formal evaluation of the method. This evaluation is presented in this report. The idea of Aronsohn is compared to the traditional contract, the bouwteam contract, the D&C contract and later also the Design Novate Construct (DNC) contract.