CMAJ OPEN, 5(2) E281 P rimary health care plays a key role in health care systems in Canada and around the world. 1,2 Studies consistently show that the vast majority of care is delivered in primary care settings [3][4][5][6][7] and that strong primary care systems are associated with improved outcomes and decreased health care costs. 5,8,9 In Ontario, primary care is the backbone of the publicly funded health care system, accounting for about 80% of all visits annually. 7,10 Over the past decade, improving and strengthening primary health care have been key priorities of successive governments in Ontario, which have implemented a series of reforms and initiatives in this key sector. 10 These include changes to payment models for physicians, formal enrolment of patients with primary care providers, support for multidisciplinary teams, support for the adoption of electronic health records and province-wide quality-improvement initiatives. 8,11,12 Family Health Teams represent the most highly reformed model of primary health care in Ontario and include all of the elements described above. 13 There is also consistent evidence that there is room for improvement in the quality of Impact of a provincial quality-improvement program on primary health care in Ontario: a population-based controlled before-and-after study