行为决策理论用行为科学的观点和方法，对人类的决策活动进行描述、解释和预测，它主要研究的是描述性决策理论。

Behavioral decision theory is used to describe, explain and forecast the human decision behavior using behavioral scientific view and method. It emphasizes on the study of descriptive decision theory.

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主观期望效用理论对人的决策的描述性效度一直受到怀疑，越来越多的实证研究表明与主观期望效用理论的公理相背离。

The descriptive validity of subjective expected utility theory has been doubted all the time, more and more empirical research violates from the axioms of subjective expected utility theory.

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前景理论是近几十年来一个优秀的关于风险下决策的描述性模型，它的出现是对预期效用理论的一个挑战，甚至可以说是对预期效用理论的一个替代。

Prospect theory is a very successful descriptive model about decision making under risk during recent several decades, it challenges the expected utility theory to fight, and even can substitute it.

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