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系统地比较了Ｐ３Ｉ和ＣＥ方法，分析了集成两者的可能性，指出综合应用Ｐ３Ｉ与ＣＥ可以有效解决复杂系统或产品的研制问题，Ｐ３Ｉ概念实际上已包括ＰＳＩ理论
The method of P3I and CE is systematically compared and the possibility of integrating the two methods is analyzed. It is pointed out that the integrated application of P3I and CE can effectively solve the development of complex systems or products. The concept of P3I actually includes PSI theory