The paper aims at answering the question: Has the measurement of patient satisfaction improved the quality of care? After concluding that there is no evidence in the literature, the paper proceeds to look at why the evidence is lacking. Four factors seem to explain it: the objectives, the focus and the originator of the patients satisfaction studies and measurements and difficulties related to the interpretation of the findings. The last part of the paper analyses why patient satisfaction should be taken seriously although we do not know whether its measurement improves the quality of care. They include the fact that the patients are partners in health care; they literally feel in their skin whether care is good or bad. They are also the best judges of certain aspects of care, such as amenities and interpersonal relations. The second reason is the transformation of health care from a sellers' market to a consumers' market where the satisfaction of the patients' needs is part of the definition of quality. Finally, there is the ideological reason that, in a democratic society, the patients should have the right to influence decisions and activities influencing them. Measurement of patient satisfaction realizes the principle of community participation in health care.