System 1 is generally automatic, affective and heuristic-based, which means that it relies on
mental “shortcuts.” It quickly proposes intuitive answers to problems as they arise. System 2, which corresponds closely with controlled processes, is slow, effortful,
conscious,
rule-based and also can be employed to monitor the quality of the answer provided by System 1. If it’s convinced that our intuition is wrong, then it’s capable of correcting or overriding the automatic judgments.