To offer insight into an issue, and especially to help refine a concept. Concept is of Major importance; the case is selected for its likely contribution to concept. In accordance with Yin, theoretical case studies need to be multiple. Based on Stake, theory can be made from one case. 29 https://hire-case-studies33486.blogsuperapp.com/40405426/helping-the-others-realize-the-advantages-of-case-study-solution