The extended-feature information model is constructed on the encapsulation of design knowledge and the extended-feature. Based on this model, CSG tree method is used to describe the design process.

通过对设计知识与广义特征的封装，构建了广义特征信息模型，在该模型基础上用CSG树的方法表示了设计过程。

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And the setup let each side avoid accountability: If a new printer flopped, was it because of bad design in the printer division--or because CSG had done a poor job in selling it?

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