零件实际存在的要素称为实际要素。实际要素是由加工形成的，在加工中由于各种原因会产生加工误差，因而图样上构成零件的点、线、面都是理想要素。
摘要:实际要素（Practical feature）零件上实际存在的要素，测量时由使用测得值表征的理想要素来代替。此时它并非该要素的具实状况
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赫兹伯格的双要素实际 Herzberg's Two-Factor Theory
景观设计也融和了美学和实际形式，用于在场地运作，收集和过滤水源等实际要素。
The landscape is also a mesh of aesthetic and pragmatic forms with the movement, collection and filtration of water a tangible element on the ground plane.
理想边界是由尺寸公差和形位公差综合形成的，它代表实际要素在满足设计要求条件下的极限状态。
An ideal boundary, which stands for the limit condition of real feature under meeting design demands, can be formed by suitable dimensional and geometrical tolerances.
如我们所看到的，很少有组织实际地以包含此重大要素的方式实践MDD。
As we will see, few organizations are actually practicing MDD in a manner that includes this vital element.
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