This volume contains a collection of papers presented at the 13th Interna- tional Conference on MUltiple Criteria Decision Making held in Cape Town during 6--10 January 1997. This was one of the regular conferences of the International Society on Multiple Criteria Decision Making, which are held at approximately two-yearly intervals. The 13th conference was attended by 143 delegates from 35 countries, and 123 papers were presented. Some of the papers which were presented are included in another volume published by Springer, namely the festschrift for Professor Stanley Zionts of Buffalo, New York, entitled Essays in Decision rnaJcing: A Volume in Honour of Stan- ley Zionts (edited by Mark H Karwan, Jaap Spronk and Jyrki Wallenius). The present volume provides a record of the technical part of the pro- ceedings of the conference. In reflecting back on January 1997, however, memories return of the social occasions, and the camaraderie which devel- oped amongst the MCDM community. Early January, at the height of the southern summer, is carnival time in Cape Town, and the mood is infectious, and was enhanced amongst those from the northern hemisphere (the major- ity of delegates) who overnight went from winter'chills (as low as -30 C) to over 30 C.