In collective or several case studies, a number of cases are diligently selected. This gives the advantage of permitting comparisons to generally be made across a number of cases and/or replication. Deciding on a "usual" case may well help the findings to get generalised to theory (i.e. analytical generalisation) https://israelbopoy.pointblog.net/getting-my-case-study-helper-to-work-71204408