This paper examines the concept and scope of surveillance in relation to health and disease with special reference to infectious disease in Israel. The methodology of surveillance is reviewed with particular consideration of legal notification. The need for selectivity in relation to notification of infectious disease is outlined and the Canadian approach set out. A brief account is given of infectious disease patterns in Israel and of how this is reflected in notification obligations. A review is strongly suggested. The need to restate the importance of infectious disease control is emphasized, as is that of cooperation with those engaged in surveillance in other fields.