This systematic review examines the effects of involving patients in the planning and development of health care. The review, conducted by Crawford et al., searched for literature published between January 1966 and October 2000, focusing on reports written in English. Out of 42 identified papers, 31 (74%) were case studies. These studies reported changes in services, such as improved accessibility and the production of patient information leaflets, as well as positive organizational attitudes towards patient involvement and patient satisfaction. However, the review found limited evidence on the impact of patient involvement on service quality, patient satisfaction, health outcomes, or quality of life. The authors conclude that while patient involvement has contributed to service changes, more robust evidence is needed to support its broader effects. The review highlights the need for a better evidence base to justify the increasing emphasis on patient involvement in healthcare decision-making.This systematic review examines the effects of involving patients in the planning and development of health care. The review, conducted by Crawford et al., searched for literature published between January 1966 and October 2000, focusing on reports written in English. Out of 42 identified papers, 31 (74%) were case studies. These studies reported changes in services, such as improved accessibility and the production of patient information leaflets, as well as positive organizational attitudes towards patient involvement and patient satisfaction. However, the review found limited evidence on the impact of patient involvement on service quality, patient satisfaction, health outcomes, or quality of life. The authors conclude that while patient involvement has contributed to service changes, more robust evidence is needed to support its broader effects. The review highlights the need for a better evidence base to justify the increasing emphasis on patient involvement in healthcare decision-making.