Healthcare quality systems have evolved from narrow inspection and compliance mechanisms into broader, multi-level architectures that combine standards, measurement, organizational learning, patient safety, equity and patient-reported outcomes. Yet the field remains fragmented, with substantial variation in how quality is defined, measured and operationalized across countries and healthcare settings. This narrative review synthesizes major international quality systems and frameworks used in healthcare delivery, examines principal methods for evaluating and improving quality, and critically discusses organizational and policy conditions associated with successful implementation. A purposive review of the seminal conceptual literature and authoritative documents from major international organizations was undertaken to identify cross-cutting themes relevant to hospitals, ambulatory care and health systems. The review shows that influential approaches—including the World Health Organization’s quality and patient safety frameworks, Joint Commission International accreditation, NCQA/HEDIS, the EFQM model, ISO-based management systems, AHRQ quality indicators and OECD performance initiatives such as PaRIS—should be viewed as complementary rather than competing models. Their effectiveness depends less on formal adoption alone than on leadership commitment, workforce engagement, data infrastructure, patient involvement and alignment with financing and regulation. Evidence is strongest for gains in standardization, safety processes, teamwork and selected efficiency outcomes; direct causal effects on patient outcomes remain less consistent, particularly when quality systems become compliance-driven or are insufficiently adapted to local context. Future healthcare quality systems should integrate equity, digital interoperability, AI-enabled learning capabilities, patient-reported measures and continuous improvement while reducing measurement burden and indicator proliferation.
Ntais et al. (Fri,) studied this question.