Measuring, modelling and evaluating computer systems : proceedings of the Third International Symposium sponsored by IRIA-LABORIA, IFIP Working Group 7.3, the Commission of the European Communities, Joint Research Centre, ISPRA Establishment and organised by Gesellschaft für Mathematik und Datenverarbeitung, Bonn-Bad Godesberg, Western Germany, October 3-5, 1977 / ed. by H. Beilner and E. Gelenbe.