An adaptive system similar to a Post production system that contains many ``if ... then'' rules called classifiers. The state of the environment is encoded as a message by a detector and placed on the message list from which the condition portion of the classifiers can be matched. ``Winning'' classifiers can then post their own messages to the message list, ultimately forming a type of computation that may result in a message being translated into an action by an effector. The strengths of the classifiers are modified by the bucket brigade algorithm, and new rules can be introduced via a genetic algorithm.
a massively parallel rule based system, whose components (classifier) can exchange messages , whose behavior is is assessed by a teacher ( reinforcement ), and which is able to learn by means of credit assignment and a genetic algorithm