Production rules system consist of (condition, action) pairs which mean, “If condition then action”. It has mainly three parts:

• The set of production rules
• Working Memory
• The recognize-act-cycle

In production rules agent checks for the condition and if the condition exists then production rule fires and corresponding action is carried out. The condition part of the rule determines which rule may be applied to a problem. And the action part carries out the associated problem-solving steps. This complete process is called a recognize-act cycle.

The working memory contains the description of the current state of problems-solving and rule can write knowledge to the working memory. This knowledge match and may fire other rules.

If there is a new situation (state) generates, then multiple production rules will be fired together, this is called conflict set. In this situation, the agent needs to select a rule from these sets, and it is called a conflict resolution.

Example:

• IF (at bus stop AND bus arrives) THEN action (get into the bus)
• IF (on the bus AND paid AND empty seat) THEN action (sit down).
• IF (on bus AND unpaid) THEN action (pay charges).
• IF (bus arrives at destination) THEN action (get down from the bus).