Annals of Systems Research

The Netherlands Society for Systems Research was founded on 9 May 1970 to promote interdisciplinary scientific activity on basis of a systems approach. It has its seat in Utrecht, The Netherlands. Officers for the year 1973: President: A. Bosman, University of Groningen. Secretary: G. de Zeeuw, Department of Psychology, University of Amsterdam. Treasurer: J. Herbschleb, Computer Laboratory, Department of Cardiology, University Hospital, Catharijnesingel 101, Utrecht. All information about the society can be obtained from the Secretary. The editor ADDRESSES OF AUTHORS Gottinger, H. W., Bayerische Akademie der Wissenschaften, Commission for Development Research, 8000 Munchen 22, Marstallplatz 8, W. Germany. Mulder, M., Stichting Bedrijfskunde, Poortweg 6, Delft, The Netherlands. Olsder, G. J., Strijbos, R. C. W., Department of Applied Mathematics, Twente of Technology, P.O. Box 217, Enschede, The Netherlands. University Rasch, R. A., Instituut voor Cognitie Onderzoek, University ofAmsterdam, Weesperplein 8, Amsterdam, The Netherlands. Rootselaar, B. van, Department of Mathematics, de Dreijen 8, Wageningen, The Netherlands. Sitter, L. U. de, Department of Social Sciences, Technological University, Eindhoven, The Netherlands.