The author joins the discussion on selection of patients in the face of life-saving resources initiated in the Journal by Parsons and Lock, Mooney and the editorial in the December 1980 issue. In this article several selection systems are discussed. The author is in favour of a `criteria-system'. The criteria for such a system are elaborated. On the basis of a sequence of values a sequence of criteria is proposed. Attention is also given to the procedural aspects.