The allocation of a contract for public construction projects in Europe usually requires a European tender procedure. This has to do with the size, the use of public means and the complexity of this type of projects. Compared to regular partnerships, it is hard to develop trust between the buyer and supplier in procurement situations. Inspired by transaction costs economics, in construction procurement processes are still considered as predominantly legal processes that are required before starting a project. Consequently the legal requirements usually prevail over the social process of deciding on the right firm to establish a collaborative relation or the best proposal for constructing infrastructure. Nevertheless, the right partner and good design are critical for project success.