An effective control mechanism is of great significance to the successful implementation of IT outsourcing projects. This paper studies the influence of contract control and trust control on outsourcing collaboration performance. Based on a survey with 32,5 questionnaires on Chinese IT outsourcing service providers, we study the influence of contract control and trust control on outsourcing collaboration performance mediated by uncertainty and moderated by project access. Empirical results show that both contract control and trust control, as well as through the mediation of uncertainty, help ...