This document defines and describes case study research. It notes that case studies are an in-depth analysis of a specific situation or small group. The document outlines different types of case studies including explanatory, exploratory, descriptive, multiple-case studies, intrinsic, and instrumental. It also discusses tools for data collection in case studies like documentation, interviews, observations, and artifacts. Principles of data collection include using multiple sources, creating a case study database, and maintaining a chain of evidence. Methods of analysis involve describing the experience, meaning, and focusing on the analysis. Merits are ideas generation and studying rare phenomena, while demerits are difficulty generalizing and potential biases.