Trans-theoretical and common factors supervision literature is quite limited. Although supervision similarities may be readily recognized, articulated trans-theoretical and common factors perspectives are rare (Bernard & Goodyear, 2014). Yet I contend that all psychotherapy supervision is most fundamentally guided by a nomological network of binding commonalities that foremost enlivens and invigorates, directs and determines supervisory action. In what follows, I identify 50 (nonexhaustive) commonalities, shared by any and all supervision perspectives, that cut across at least 9 practiceimpacting areas: Supervisee characteristics, supervisor qualities, supervisee change processes, supervision structures, supervision relationship elements, supervision common principles, supervisor tasks, supervisor common roles, and supervisor common practices. I argue that, even if a supervisor practices a particular brand of supervision (e.g., psychoanalytic, cognitive), practice will be affected by and be delivered via the cross-cutting commonalities identified here. These commonalities converge to form what could be thought of as a common factors, common processes, common practices supervision perspective. I further argue that psychotherapy supervision is eminently an educational enterprise, an adult learning experience (e.g., Knowles, Holton, & Swanson, 2015), and is at its best when those realities are consistently integrated into our supervisory conceptualization and conduct.