Very well drawn and well explained. Each step listed here raises interesting questions and discussions as well as limitations but nonetheless is a good visual introduction.
Related, the problem with peer review.
The problem with peer review is the peers. Who are “the peers” of four M.D.’s writing up an observational study? Four more M.D.’s who know just as little as the topic. Who are “the peers” of a sociologist who likes to bullshit about evolutionary psychology but who doesn’t know much about the statistics of sex ratios?