The concept—and reality—of continuity of care crosses disciplinary and organisational boundaries. The common definitions provided here should help healthcare providers evaluate continuity more rigorously and improve communication Patients are increasingly seen by an array of providers in a wide variety of organisations and places, raising concerns about fragmentation of care. Policy reports and charters worldwide urge a concerted effort to enhance continuity,1–3 but efforts to describe the problem or formulate solutions are complicated by the lack of consensus on the definition of continuity. To add to the confusion, other terms such as continuum of care, coordination of care, discharge planning, case management, integration of services, and seamless care are often used synonymously. This synthesis was commissioned by three Canadian health services policy and research bodies. The aim was to develop a common understanding of the concept of continuity as a basis for valid and reliable measurement of practice in different settings. We searched academic and policy literature for documents in which the principal focus was continuity of patient care or continuity. We searched electronic databases (Medline, HealthSTAR, Embase, CINAHL, Current Contents, PsychINFO, AIDSLINE, CancerLit, Cochrane Library, Dissertation abstracts, Papers1st (conferences and paper abstracts), Web of Science, WorldCat) as well as web library catalogues, peer reviewed internet sites, internet search engines, and several in-house databases. The search included documents dated from 1966 to November 2001 written in English, French, or Spanish. The reviewers (RJR, JLH, RMcK) used a data abstraction form to summarise relevant documents from every health discipline, and all reviewers read key documents. We presented the results of an initial review of 314 documents to participants of a workshop on continuity held in Vancouver in June 2001. We obtained structured feedback to a discussion paper, problem based scenarios, and expert presentations. Participants validated the common themes …