This document provides an overview of case studies as a research method. It defines case studies as an in-depth analysis of a bounded system or small group. The document outlines the characteristics of case studies, including that they provide a unique example of real-world situations. It also discusses the strengths of case studies in capturing lived experiences and the weaknesses in generalizing findings. Additionally, the document reviews types of case studies, why they are useful research tools, best practices for conducting case studies, and different design approaches.