Because a single case cannot adequately represent the whole population from which it is drawn, a case study may lack

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External validity refers to the extent to which the findings of a study can be generalized to a wider population. Since a single case study cannot accurately represent the entire population, it may lack external validity. Reliability refers to the consistency of results, internal coherence refers to the logical consistency of the study, and narrative truth refers to the subjective truth of the case study. While these factors may also be impacted by limitations in a single case study, external validity is the most significant concern.

Because a Single Case Cannot Adequately Represent the Whole Population