Rationally Justifiable Play and the Theory of Non-Cooperative Games
定义了可辩护策略、辩护理论及完全辩护理论的概念，并证明了一个不可能性结果：不存在包含期望效用最大化、共同知识和谨慎假设的完全辩护理论。
The paper defines the concept of a justifiable strategy, that of a justification theory (which shows strategies to be justifiable) and that of a complete justification theory (which for every strategy shows whether it is justifiable or not). An impossibility result is proved, showing that there can be no complete justification theory which includes the assumptions of expected utility maximisation, common knowledge and caution.