Abstract: The question of how to make decisions is a scientific investigation in the 21st century. Among many decisionmaking theories and models, the EquatetoDifferentiate theory as a descriptive approach makes itself salient in explaining and predicting individuals decisionmaking behavior. According to this theory, people have to “equate” less significant difference between prospects on either the best possible or the worst possible outcome dimension, thus leaving the greater onedimensional difference to be differentiated as the determinant of the final choice.The proposer of the theory, Professor Shu Li, has recently compiled his ideas and findings into a book named An EquatetoDifferentiate Way of DecisionMaking. In this book, the author has successfully demonstrated the scientific verification of the EquatetoDifferentiate theory in multiple fields of decision making. Moreover, the author has also developed the EquatetoDifferentiate way to understand decisionmaking in practice, thus providing a simple but efficient rule to guide individuals choice and decision.

Key words: decisionmaking; EquatetoDifferentiate theory; descriptive approach; prescriptive approach; normative approach