Case study

A case study is a very deep look at one specific thing.

This could be a person, a group, or even a whole event. It happens in the real world, not just in a lab. For example, a doctor might study one patient to understand a sickness. A business person might study how one company makes a plan. A politician might look at a single election or even a huge war. These studies help us understand how the world works in detail.

There are different ways to set up these studies. Some researchers look at just one single case. This is called within-case research. Other researchers look at many different cases at once. This is called cross-case research. Some people use a design where they do not start with a theory. This is linked to the work of Kathleen M. Eisenhardt. Other designs follow the ideas of Robert K. Yin. There are also ways to look at how people build their own reality, like Robert E. Stake. Some even look for things that seem strange or out of place, like Michael Burawoy.

Choosing the right subject is a very important job. Researchers do not always pick things at random. Picking things at random can sometimes lead to mistakes or bias. Instead, they look for cases that give them a lot of information. They might pick an extreme case because it is very unusual. They might pick a deviant case because it goes against what people expect. Some pick influential cases that are central to a big idea. For instance, Nazi Germany is an influential case in theories about fascism. Other researchers look for cases that are very similar or very different to see what changes.

Many smart people have used these methods to learn great things. John Gerring is a scholar who has written about these ways of studying. He says case studies help us understand a larger group of similar things. He also talks about how they use different kinds of evidence. In 2015, John Gerring and Jason Seawright listed seven ways to pick a case. These include typical, diverse, extreme, deviant, influential, most similar, and most different cases. Other experts like Arend Lijphart and Harry Eckstein identified five types of designs. Alexander George and Andrew Bennett even added a sixth type.

Case studies are great for finding new ideas and building theories. A theory is a way to explain why things happen. Charles Darwin used case studies to understand how life changes. He studied animals while he traveled to the Galapagos Islands. Another thinker, Douglass North, used case studies of early states like England. These studies help us see the small details that numbers might miss. They help us see the full story of how one thing leads to another. This makes our understanding of the world much richer and deeper.