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This text is concerned with situations in which several persons reach decisions independently and the final consequence depends, potentially, upon each of the decisions taken. Such situations may be described formally by an extensive form game: a mathematical object which specifies the order in which decisions are to be taken, the information available to the decision makers at each point in time, and the consequence that results for each possible combination of decisions. A necessary requirement for rational behaviour in such games is that each decision maker should reach a decision that is optimal, given his preferences over his own decisions. This requirement is far from sufficient, however, since every decision-maker should in addition base his preferences upon the conjecture that his opponents will act optimally as well. It is this principle that distinguishes nonco-operative game theory from one-person decision theory. The main purpose of this volume is to discuss different formalizations of this principle in extensive form games, such as backward induction, Nash equilibrium, forward induction and rationalizability, under the assumption that the decision-makers' preferences are given by subjective expected utility functions. The various formalizations, or rationality criteria, are illustrated by examples, and the relationships among the different criteria are explored.

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Andrés Perea completed his Ph.D. in 1997 at Maastricht University, The Netherlands. From 1997 to 1998 he worked as a visiting professor at Universitat Autonòma de Barcelona. In addition, from 1998 to 2000, Andrés worked at Universidad Carlos III as a visiting professor, and from 2000 on as an associate professor.

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