# Idea System 2 thinking processes are slower relative to [[system 1 thinking]]. They are more analytical, resource demanding, and able to operate only serially. A key claim and prediction is type 2 processing can override or rationalize the output of [[system 1 thinking|type 1 processes]]. System 2 thinking correlates with cognitive ability and intelligence. Using cognitive abilities requires the instantiation of [[system 2 thinking|type 2 processes]]. Thus, to measure the effects of [[system 2 thinking]] on some outcome, we must also measure cognitive ability or intelligence. # References