The use of portfolios in postgraduate medical residency education to support competency development is increasing; however, the processes by which these assessment systems are designed, implemented, and maintained are emergent. The authors describe the needs assessment, development, implementation, and continuing quality improvement processes that have shaped the Portfolio Assessment Support System (PASS) used by the postgraduate family medicine program at Queen's University since 2009. Their description includes the impetus for change and contextual realities that guided the effort, plus the processes used for selecting assessment components and developing strategic supports. The authors discuss the identification of impact measures at the individual, programmatic, and institutional levels and the ways the department uses these to monitor how PASS supports competency development, scaffolds residents' self-regulated learning skills, and promotes professional identity formation. They describe the "academic advisor" role and provide an appendix covering the portfolio elements. Reflection elements include learning plans, clinical question logs, confidence surveys, and reflections about continuity of care and significant incidents. Learning module elements cover the required, online bioethics, global health, and consult-request modules. Assessment elements cover each resident's research project, clinical audits, presentations, objective structured clinical exam and simulated office oral exam results, field notes, entrustable professional activities, multisource feedback, and in-training evaluation reports. Document elements are the resident's continuing medical education activities including procedures log, attendance log, and patient demographic summaries.The authors wish to support others who are engaged in the systematic portfolio-design process or who may adapt aspects of PASS for their local programs.