This document provides an overview of case study research. It defines a case study as an in-depth analysis of a bounded system, such as an event, process, or individuals. Case studies are used to answer descriptive "what happened?" and explanatory "how or why did something happen?" questions. They provide a contextual understanding of real-world situations. The document discusses different types of case studies, including intrinsic, instrumental, collective, explanatory, exploratory, and descriptive. It also outlines the design process for case study research and discusses strengths and limitations of the approach.