The implementation of information technology and its association with organizational change has been an important theme in the Information Systems (IS) literature over the past 30 years. The progression of variance and process theories provide an in-depth overview of the emergence of richer accounts of IS change. In this paper we chronicle the evolution of process models and related theory. We also show how the application of process thinking in IS research has improved our understanding of complex IS change. These models depict more faithfully actors’ lived experiences and preserve the details and essential effects of critical events. An emerging benefit the process models is the capability to identify common patterns in a project’s evolutionary trajectory.