A fuzzy multi-criterion decision is used for radiotherapy problem. The prob
lem is faced with two goals: The first is to maximize the fraction of survi
ving normal cells and the second is to minimize the fraction of surviving t
umor cells. The theory of fuzzy sets has been employed to formulate and sol
ve the problem. The solutions obtained by fuzzy-decision theory are always
efficient and best compromise. (C) 2000 Elsevier Science B.V. All rights re
served.