Case studies (also called "case histories") are accounts of real engineering situations and projects that provide a context for engineers and others to explore problems. Case studies typically involve complex issues where there is often no single correct answer--you may be asked to select the "best" answer given the situation. Case Studies are found in many places, including book collections, scholarly articles, educational videos and the websites of professional organizations, and more.
Case studies allow you to:
Explore the nature of a problem and circumstances that affect a solution
Observe theories applied in a real-life situation
Learn about others' viewpoints and how they may be taken into account
Define your priorities and make your own decisions to solve the problem
Predict outcomes and consequences
Source: University of Washington Library