Determine which case study type, design or style is most suitable to your intended audience. Corporations may choose illustrative case study method to show what has been done for a client; schools, educators and students may select cumulative or critical case study method and legal teams may demonstrate exploratory (investigative) case study method as a way to provide factual evidence.Whatever case study method you're employing, your purpose is to thoroughly analyze a situation (or "case") which could reveal factors or information otherwise ignored or unknown. These can be written about companies, whole countries, or even individuals. What's more, these can be written on more abstract things, like programs or practices. Really, if you can dream it, you can write a case study about it.