Telephone triage and telephone advice services present new opportunities for medical services to advise on health care matters. The objective of the study presented in this thesis is to investigate to what extent the process of telephone care at out-of-hours centres in the Netherlands is executed in accordance with accepted professional standards. Accepted professional standards incorporate criteria for communication skills, for clinical management and the quality of the report of the call. To assess the quality of telephone communication and of the reports a special assessment tool was developed. It is called the RICE rating list.