Deviant cases are cases that defy current theories and customary sense. They not have only Severe values on X or Y (like Excessive cases) but defy existing expertise about causal relations. Editor's Observe: This site publish was at first published in February 2017 but was up to date for comprehensiveness https://hbs-case-study-writing-he40218.blogsumer.com/31416978/top-hbs-case-study-analysis-secrets