In collective or many case studies, quite a few cases are thoroughly chosen. This gives the benefit of making it possible for comparisons to generally be made across many cases and/or replication. Choosing a "usual" case may perhaps empower the findings to get generalised to concept (i.e. analytical generalisation) https://emiliomrtoo.blogzet.com/case-study-helper-things-to-know-before-you-buy-48375715