Annals of Systems Research Volume 6

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 1978: President: G. Broekstra, Graduate School of Management, Delft Secretary: N. J. T. A. Kramer, Department ofIndustrial Engineering, Eindhoven University of Technology, Postbus 513, Eindhoven. Treasurer: J. N. Herbschleb, University of Utrecht. All information about the society can be obtained from the secretary. The editor ADDRESSES OF AUTHORS Boot, M. , Institute of Applied and Computational Linguistics, State University Utrecht, Wilhelminapark 11, Utrecht, The Netherlands Broekstra, G. , Graduate School of Management, Poortweg 6--8, Delft, The Netherlands Dijkstra, W. , Free University, Department of Research Methods, De Boele­ laan 1115, Amsterdam, The Netherlands V. J. J. P. , University of Leiden, Institute of Phonetics, Schut­ Van Heuven, tersveld 9, Leiden, The Netherlands Kooijman, S. A. L. M. , Central Lab. TNO, Postbus 217, Delft, The Nether­ lands Koppelaar, H. , State University Utrecht, Department of Psychology, Model­ and Statistics Group, Jacobsstraat 14, Utrecht, The ling, Psychometrics Netherlands Kruijt, D. , State University Utrecht, Department of Sociology, Center for Comparative Socio-economic studies, Heidelberglaan 2, Utrecht, The Netherlands Metz, H. A. J. , University of Leiden, Institute of Theoretical Biology, Stations­ weg 25, Leiden, The Netherlands Verhoeff, J. , Erasmus University, Rotterdam, The Netherlands Van der Zouwen, J.