P.89) System 2 deals with purposeful questions, whether from abroad or from within. There is no limit to what these questions can be, but they must be specific. System 1 constantly monitors what is happening internally and externally. These basic assessments play an important role in intuitive judgement because they substitute for more difficult – that is the idea behind heuristics and biases.
P. 90) System 1 has been shaped by evolution to provide a continuous assessment of main survival problems. Is everything normal? Is there a threat or a major opportunity? Should I approach or avoid? How are things going? Even though less relevant today in ancestral past, our brains still work this way.