3.2.1 The Execution of Selections
After the system has read and processed a sentence, all conditions in the knowledge structure are reviewed by the system and the corresponding action or alternative action is processed (executed). This process is repeated until there are no more changes in the system. The system is then in a state of rest and the system can read and process the next sentence.
In this way it seems as though the system is 'thinking', but it is actually only using programming that is written in natural language.