A health care system is only as strong as its primary care sector, 1 which provides "entry into the system for all new needs and problems, provides person-focused (not disease-oriented) care over time, provides care for all but very uncommon or unusual conditions …" 2 Patient enrolment, team-based care, information technology, and funding and remuneration schemes that foster comprehensiveness and collaboration are key characteristics of effective primary care systems.3 None can be singled out as the most determining, but how they are clustered defines a limited set of organizational models that have been associated with a variety of outcomes. 4 Canadian provinces have implemented different primary care models with different scopes of changes.5 Research has not yet identified a "winning" model. For example, in Ontario, community health centres deliver better chronic illness care 6 but have less accessibility than feefor-service enrolment models, 7 and no model provided more comprehensive preventive care. Walk-in clinics achieved better quality scores than did family medicine clinics for treatment of a set of acute problems.9 How the work is organized may be as important, if not more important, than what the model is called.These observations suggest that the challenges associated with providing high-quality services differ depending on the nature of care considered.9-11 Even if chronic illness is a major challenge, the quality of care must not be improved at the expense of accessibility, preventive or good episodic care, which are all essential components of primary care.In this study, we report the results of the quantitative component of a multimethod observational study conducted in Quebec to determine which organizational characteristics of primary care practices are associated with high-quality care. We sought to find a quality measure of care that would encompass the comprehensive nature of primary care (episodic, chronic and preventive care), and we explored how the contribution of organizational characteristics varied based on the type of care provided.