In this paper, we explore two models of the impact of Information Technology (IT) on control based on the perspective of leadership theories. The objective is to explain how IT can enhance the control mechanisms in a work group. Review of leadership literature suggests two relevant theories: leadership behavior theory and leadership substitute theory. TO explore these conceptual models, data was collected from 136 managers and professionals who use well-established information systems. The data provides support that ITs impact on control can be explained through its effects on the control factors identified from the two leadership theories. The two models are equally powerful in explaining the criterion variance of control, and the two sets of independent variables from the models are highly correlated, suggesting that either model is good for the study of Irs impact on control. In addition, the data provides support that the impact of IT on control is stronger in dynamic environments. The data also shows that the innovative ability of a work group is positively related to ITs impact on control.