With regard to case choice, Gary King, Robert Keohane, and Sidney Verba warn against "choosing over the dependent variable". They argue for instance that scientists can't make valid causal inferences about war outbreaks by only checking out situations in which war did materialize (the researcher must also check out cases https://emiliocsnql.blogcudinti.com/29878859/details-fiction-and-harvard-case-study-writing-help