With regards to case choice, Gary King, Robert Keohane, and Sidney Verba alert from "picking over the dependent variable". They argue one example is that scientists cannot make valid causal inferences about war outbreaks by only checking out situations where by war did materialize (the researcher also needs to check https://sergiohugpn.alltdesign.com/the-definitive-guide-to-case-study-help-51571006