This document discusses various models of decision making processes. It describes the rational model which takes a strictly logical approach through 5 steps. However, the alternative model led by March and Simon argues this is not realistic for humans with limited resources. The alternative model involves bounded rationality and intuitive decision making. Small group decision making can involve different paths like unitary or complex cyclic sequences. However, groupthink where unanimity overrides real evaluation can be problematic. Participation and collaboration models also differ in whether success relies on meeting individual needs or organizational structure. Overall, the ideal rational process is difficult to achieve fully, so decision makers rely on shortcuts and intuition.