In collective or many case studies, quite a few cases are very carefully selected. This features the advantage of letting comparisons to get built across many cases and/or replication. Deciding on a "regular" case might enable the findings being generalised to idea (i.e. analytical generalisation) or to test idea https://hbr-case-study-analysis37245.blazingblog.com/31197088/case-study-help-an-overview