The temporary organisations formed in many projects create a situation in which trust between individuals is important to the successful completion of the project. Unfortunately, because the organisation is temporary, there is not time to develop long-term trust in interpersonal relationships. It is suggested that the initial opinions of the individuals entering the project are important in shaping its final outcome. The initial opinions can force the project into a spiral of increasing or decreasing trust. Methods are suggested of reversing the outcome when the initial attitude is one of mistrusting the other parties, to enable the project manager to build a more positive environment.