清楚显示出项目所有可供选择的行动方案，行动方案之间的关系，行动方案的后果，后果发生的概率，以及每种方案的损益期望值；使纷繁复杂的决策问题变得简单、明了，并且有理有据；用数据说话，形成科学的决策，避免单纯凭经验、凭想象而导致的决策上的失误。-Clearly shows all options for the project action plan, the relationship between the action program, the consequences of action programs, the consequences probability of occurrence, as well as profit and loss expectations for each program　make complicated decision-making problem becomes simple, clear, and reasoned　speak with the data, a scientific decision-making, to avoid simple rule of thumb, with imagination as a result of decision-making errors.