Assessing competency across domains of knowledge, skills, and behavior is critical to ensure that graduating orthopaedic residents possess the requisite skills and attributes to enter independent orthopaedic practice. Of the domains, knowledge is most easily assessed. In addition to the AAOS Orthopaedic In-Training Examination®, which provides a yearly gauge of residents' orthopaedic knowledge relative to their peers, there are several online platforms such as Orthobullets, the American Academy of Orthopaedic Surgeons ResStudy program, and the Journal of Bone and Joint Surgery Clinical Classroom that offer online learning resources and question banks. Clinical skills are best assessed through a combination of observation tools, including live or video assessments, 360° evaluations, and objective structured clinical examinations. Surgical skills can be evaluated in two domains: live surgical cases or simulations. The American Board of Orthopaedic Surgery is attempting to standardize live surgical evaluations through the use of the O-P tool. Although most available models feature only arthroscopic procedures, surgical simulators provide for opportunity to objectively evaluate resident performance. Behavior and professionalism has traditionally been the most challenging domain to assess. The American Board of Orthopaedic Surgery's Behavior Assessment Tool has demonstrated success in pilot testing and is being introduced as the standard for measuring behavior and professionalism in orthopaedic training. Although no single assessment tool can accurately gauge a resident's overall performance, a combination of readily available tools should be used to assess competence across domains.