It has its seat in Utrecht, The Netherlands. Officers for the years 1975/1976: President: G. Broekstra, University of Delft Secretaries: G. De Zeeuw, University of Amsterdam (acting secretary) G. R. Eyzenga, University of Groningen Treasurer: J. N. Herbschleb, Computer Laboratory, Department of Cardio logy, University Hospital, CatharijnesingellOl, Utrecht. All information about the society can be obtained from the acting secretary. The editor is happy to announce that H. Koppelaar from the State University Utrecht will act as associate editor of the Journal. Moreover, the following scientists have declared to be willing to act as member of the editiorial board: Professor G. Klir, State University of New York, Binghamton, New York, U.S.A. Professor S. Braten, Institute of Sociology, University of Oslo, Blindern, Norway Professor B. R. Gaines, Department of Electrical Engineering Science, Univer sity of Essex, Colchester, U.K. Professor Maria Nowakowska, Department of Praxiology, Polish Academy of Sciences, Warszawa, Poland. Professor F. Pichler, Department of Systems Theory, Johannes Kepler Univer sity, Linz-Auhof, Austria. Professor B. Zeigler, Department of Applied Mathematics, Weizmann Institute of Science, Rehovot, Israel. The editor ADDRESSES OF AUTHORS Broekstra, G., Graduate School of Management, Poortweg 6-8, Delft, The Netherlands. Dalenoort, G. J., Institute for experimental psychology, State University Groningen, Biological Centre, Section D, Kerklaan 30, Haren (Gr.), The Netherlands.

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