This document outlines the five components of a case study design according to Yin: study questions, study propositions or theoretical framework, identification of the unit of analysis, logical linking of data to propositions or theory, and criteria for interpreting findings. It then describes four types of case study designs: exploratory (examines a topic with little prior research), explanatory (provides explanations for phenomena), descriptive (portrays and conceptualizes a phenomenon), and evaluative (makes judgements, often for programs).