迄今为止，三维ＣＡＤ系统在机械制造行业中的小型企业中用得很少。作者一方面分析了该现象的原因，另一方面又指出了使三维ＣＡＤ系统比二维ＣＡＤ系统如何在实际工作中更快实现本质上的合理化。除了适用于行业的方法外，企业专用的方法也很重要。用户能够通过示教借助于有效的工具，如三维参数化、组合规则，以及宏技术独立开发这些方法。 Until now, 3D CAD systems have been used very little by small businesses in the machinery manufacturing industry. On the one hand, the author analyzes the reason of the phenomenon and on the other hand, he points out how to make the three-dimensional CAD system essentially rationalized faster than the two-dimensional CAD system in practical work. In addition to industry-specific approaches, company-specific approaches are also important. The user can teach these methods independently with the aid of effective tools such as three-dimensional parameterization, composition rules, and macro techniques.