Similar title to Fedra, K. & Reitsma, R.F. (1990). Decision Support and Geographical Information Systems. IIASA Research Report (Reprint). IIASA, Laxenburg, Austria: RR-90-009. Reprinted from Geographical Information Systems for Urban and Regional Planning, H.J. Scholten and J.C.H. Stilwell (eds), Kluwer Academic Publishers, Dordrecht, Netherlands, pp. 177-188 [1990].