Instrumental case studies are employed once the case is employed to provide Perception into a selected challenge or phenomenon. A collective case study, Alternatively, requires studying numerous cases concurrently to investigate some typical phenomena. You'll be able to examine the preface and Chapter one of Yin's e-book below. See https://find-someone-to-do-case-s63574.ampedpages.com/everything-about-case-study-help-61685255