In recent years, peer review of teaching (PROT) has become an increasingly important tool for evaluating library instruction. Most PROT programs consist of three components: a pre-observation meeting, the observation of teaching, and a post-observation session. The post-observation feedback session can be especially challenging—for both the observer and the observed. Drawing upon literature addressing the peer review of teaching, the authors recommend a set of best practices for providing constructive criticism to fellow instruction librarians