The purpose of this paper is to propose critical success factors for effectively managing information systems(IS) outsourcing. The survey method was used for this paper, and data from a total 106 companies that were listed greater than $10 million were used for the analysis. To analyze the data, structural equation model was used. The results of this empirical study is summarized as follows. First, both formal control based on contract and informal control based on trust have a positive effect on control level which is a determinant indicator of IS outsourcing performance. Second, management capability such as preparedness capability and relationship capability have a positive effect on formal and informal control mechanism. The findings have important implications for the role of trust and management capability in formal management control.