Supervision is key to a new social worker’s continuing development. Research supports the importance of supervision, but the literature is lacking regarding what is and is not taught in curriculum, what best practices are in training someone to become an effective supervisor, and what the impact of supervision can be on supervisee competence. The following systematic review asks the question, will providing quality supervision increase a supervisee’s competence, with specific focus on curriculum, best practices, and the impact of supervision. The dearth of research in this area implies a call for changes to curriculum, application of established supervision best practices, and that there is a positive effect on supervisors’ knowledge and confidence, supervisees’ competence, and client outcomes when a supervisee receives effective supervision.