In collective or many case studies, a number of cases are thoroughly picked. This delivers the advantage of making it possible for comparisons for being made across a number of cases and/or replication. Selecting a "common" case may perhaps allow the findings to generally be generalised to theory (i.e. https://israeldfgnz.bloggosite.com/35397847/the-smart-trick-of-hbr-case-study-analysis-that-nobody-is-discussing