Effort Is Required to Maintain Simultaneously in Memory Several Ideas

Effort is required to maintain simultaneously in memory several ideas that require separate actions. System one detects simple relations, they are all alike and excels at integrating information about one thing. But it does not deal with multiple distinct topics at once. For example, system two is the only one that can follow rules compare objects on several attributes and make deliberate choices between options. The automatic system one does not have these capabilities.