Project deviations of different types are used to examine the theorized role of Locus of Control on two types of project outcomes: process performance and developer satisfaction. A survey of 315 professional project managers is analyzed with PLS-SEM to quantify the direct effects of requirements fluctuations, staff fluctuations and technology fluctuations as well as the contingent effects from External Locus of Flux. We demonstrate the consequences of deviation events that complicate efforts to maintain situational control. Implications for research and practice are discussed.