Also, when we study individual cases in depth, we study them in depth and even if we have limited variables it helps us build our hypotheses. The case we selected could be the subject of analysis because of an interest in the case itself or because of an interest in building a theory about that particular case. So far we have different types of case studies, these are; theoretical case studies, interpretive case studies, hypothesis case studies, confirmation and theory confirmation case studies and finally deviant case studies. Confirmatory and theory-confirming case studies are analyzes of individual cases within the framework of established generalizations. The case study is a proof of the proposition, which can be confirmed or denied by it. Deviant case analyzes are studies of single cases known to deviate from the established generalization. Among the six theories, deviant and hypothesis-generating case studies have the greatest value in terms of contribution