论系统工程方法（论）由“硬”变“软”的内在根由

本文通过对系统工程领域具有代表性的三种方法（论）演变过程的梳理，总结出他们共同的变化特点：研究对象（应用范围）越来越复杂化，相应的所采用的系统工程方法（论）也越趋“软化”，即：改变了原来只一味追求用数学方法进行定量分析的理路，转而，注重定性的研究或定性与定量相结合的研究理路；最后，文章从哲学的层面探讨该变化的内在根由。

Root-cause for the Turning in System Engineering: from Rigid Method(Methodology)to Flexible

Analyzing the turning of three representative methods(methodologies) in system engineering,the authors summarized the common characteristic showing that research objects(applied range) became more and more complicated,and the corresponding methods(methodologies) was becoming more and more flexible.That is to say the early research approach which simply sought for the quantitative analysis using mathematical method is turning to that of focusing on the qualitative analysis or the combination of the quantitative and qualitative analysis.Finally,the root-cause of the turning is discussed on the level of philosophy.