Continuity of care is a core value of primary health care. [1][2][3][4] It is highly valued by patients and general practitioners (GPs). 5,6 According to the late Barbara Starfield, continuity should be both relational and informational to be effective. 7 To date, numerous studies have demonstrated continuity of care to be associated with multiple benefits for patients, doctors, and health systems. These benefits include reduced mortality rates, 8-11 fewer hospital admissions, 8,12,13 fewer emergency department (ED) visits, 14,15 reduced health care costs, 16,17 increased physician productivity, 18 better uptake of preventive care, 19,20 better medication adherence, 21-23 more appropriate prescribing, 24,25 improved quality of life, 26 a better patient clinician relationship, 27,28 improved patient satisfaction, [29][30][31] and physician satisfaction. 32 The last decade, these benefits have been consistently demonstrated across different patient populations, including patients with diabetes, 33,34 cardiovascular disease, 35 severe mental illness, 36-38 dementia, 39,40 older patients (ie, 80% or more aged ≥ 65 years), 41,42 and children. 43 The evidence base for continuity of care continues to grow, giving rise to multiple systematic reviews for various outcome measures. 9,10,12,16,17,24,34,37 Also, study results have been reproduced and replicated-using different continuity measures in both comparable and different populations, leading to an increasingly robust wall of evidence.Despite this wall of evidence, continuity of care in family practice has been in sharp decline over the past decadesboth in the United Kingdom and the United States, [44][45][46] negatively affecting health outcomes for patients, doctors, and society. Previously, this decline was mainly explained qualitatively or narratively: eg, patients and doctors are increasingly mobile, solo practice is becoming rare, the number of patients with chronic diseases-and corresponding multiple professionals employed by different organizations-is rising, family