As pedagogical leaders, principals and vice-principals must necessarily prioritize teacher supervision. Whether used individually or with a group, this effective approach centers on improving educational services for students and optimizing their academic achievement. However, teacher supervision is influenced by ambiguities and several types of challenges related to the concept of supervision, the actors' perceptions and beliefs, and the various systemic structures at play. This competency standards framework presents the knowledge, the know how to do, the know how to be, and the know how to become every successful teacher supervisor should possess, and proposes for each order a summary of existing literature and accessible theories. This competence reference manual will help supervisors acquire invaluable pedagogical and relational skills to perform high-quality, high-results supervision.