Acting rationally reason with acts such as: the agent (agent is a utility that has the ability to act, or is an agent in various automation system) can be performed with the reason is agent that acts to achieve the goals that have been set up, such as automatic driving system agent whose goal is to reach the goal in the shortest distance. To select the target path to the shortest possible so it will be another reason to act as agent with agent, for example, in the game of chess, the goal is to defeat the opponent. To select the move that will make the opponent lose quickly, etc.