The automatic System (AS) also known as system 1. It excels in integrating information about single thing, but does not deal with several objects simultaneously. It uses broad relations like "all Xs are Y" or "X is higher then Y". It is good at habitual thinking and fast thinking[1]..
It is part of two systems of decision making, the first is the automatic-system(system 1) which decide fast by intuition and the second is the ECS which produce reasoning. The term system-1 and system 2 was given by Stanovich and West[2]