Theory is considered to be the bedrock of academic research, often being viewed as the foundation upon which scientific enquiry is organized and built. Despite its ubiquity throughout information systems research, there is much that remains unknown about theory. The Handbook of Research on Contemporary Theoretical Models in Information Systems provides a comprehensive overview and coverage of various theories, models, and related approaches used within information systems research. A defining collection of field advancements, this Handbook of Research offers examples and descriptions of real-world applications of various theories based on empirical studies.