Regarding case choice, Gary King, Robert Keohane, and Sidney Verba warn versus "picking out on the dependent variable". They argue for example that researchers are unable to make valid causal inferences about war outbreaks by only considering instances exactly where war did happen (the researcher also needs to look at https://case-study-writing-help85740.bloggerbags.com/35175148/considerations-to-know-about-hbr-case-study-analysis