nObject-based cognition (object) – thinking defined purely in terms of the logic of objects (science & engineering) nRational cognition (brain-based)– people are logical (cognitive science) nBounded rationality (brain-based)– people are not always rational and there are good reasons (post-positivist cognitive science) nAffective cognition (brain + body) – people think using body processes and brain processes (combined cognitive & neurological science)