Aaron Rapport reformulated "minimum-probable" and "most-very likely" case choice tactics into the "countervailing circumstances" case range system. The countervailing conditions case selection technique has three parts:[31] The time period Expert case study is co-opted from the exploration case study, a approach to experimentation that focuses on just one specific case https://hectorfgieh.blogocial.com/harvard-case-study-writing-help-an-overview-69196033