youdao

So it is more likely UCD stands on a higher level than the ACD, but ACD focuses on some more detailed stuff: the activities.

所以从某种程度上来说是UCD站在了一个更高的层次上去看整个用户，而ACD则是更深入地去研究用户的构成要素之一：行为。

youdao

Comparing with UCD, ACD has minimized the persona data to an "activity" level, really convenient for some quick developing, but loses some important characteristics of a fully built persona.

和UCD相比起来，ACD将人物角色模型的数据量减少到仅有行为的程度，对于快速开发来时相当的方便，但是与完整的人物模型相比，失去作为一个角色的一些重要的特性。

youdao