In this paper, the reasoning and planning capabilities of an au- tonomous mobile robot are described; The reasoning system that controls the robot is designed to exhibit the kind of be- havior expected of a rational agent, and is endowed with the psychological attitudes of belief, desire, and intention. Because these attitudes are explicitly represented, they can be manipu- lated and reasoned ... [Show full abstract] about, resulting in complex goal-directed and reflective behaviors. Unlike most planning systems, the plans or intentions formed by the robot need only be partly elaborated before it decides to act. This allows the robot to avoid overly strong expectations about the environment, overly constrained plans of action, and other forms of overcommitment common to previous planners. In addition, the robot is continuously re- active and has the ability to change its goals and intentions as situations warrant. The system has been tested with SRI's au- tonomous robot (Flakey) in a space station scenario involving navigation and the performance of emergency tasks.