Failure to realize the expected key performance indicators in a sustainable manner has characterized and continues to be a major challenge facing many income-generating projects, especially those established by catholic religious congregations in central Uganda. It, therefore, constitutes concern that motivated the conducting of an empirical study to analyze whether it was caused by the management of the projects or not. The study was conducted as a descriptive cross-sectional survey involving a correlation design. Its sample was 92 respondents who included superior generals, project coordinators, treasurer generals, and project managers. This paper covers a part of this study that analyzed how the control of the projects accounted for realizing their key performance indicators in a sustainable manner. Accordingly, this paper analyzes (a) the nature of control exercised in these projects, (b) the level at which the projects realize their key performance indicators sustainably, and (c) the effect of the exercised control on the level at which the projects realizes their key performance indicators in a sustainable manner. The paper analyses these issues using descriptive and multivariate regression analysis after reviewing the literature on control and performance indicators of income-generating projects and explaining the methodology used to conduct the study. Findings indicate that the control exercised in most of the projects is ineffective and its effect on their realization of key performance indicators is weak. The study is therefore concluded by emphasizing the need to improve the control of the projects to effective levels. Consequently, recommendations are made to the top leadership of the congregations and project managers to effectively play their roles in the control of the projects while putting emphasis on ensuring effective supervision, monitoring and provision of feedback.