The objective of Citizens Advisory Systems for Health in Europe is to provide background information in preventive health care, to offer data-based and knowledge-based facilities and to reduce costs within the national and European wide health systems. In order to do so, easily accessible human-computerdialogues and systems have to or have been already developed, allowing every citizen to obtain the right information at the right place at any time with any intensity which is wished. The paper will describe the already existing standards, will explain the ideal type and the technical and social implications which have to be taken into consideration for these systems.