# Class diagram issue

**URL:** <https://forums.visual-paradigm.com/t/class-diagram-issue/11698>\
**Category:** UML\
**Created:** [February 16, 2011, 3:11pm UTC](https://forums.visual-paradigm.com/t/class-diagram-issue/11698 "2011-02-16T15:11:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Anonymous](https://avatars.discourse-cdn.com/v2/letter/a/8491ac/32.png) [@Anonymous](https://forums.visual-paradigm.com/u/Anonymous)\
**Post date:** [February 21, 2011, 10:21am UTC](https://forums.visual-paradigm.com/t/class-diagram-issue/11698/1 "2011-02-21T10:21:20Z")

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I want to ask, in general, should we include “anonymous user” as a class in class diagram?

thanks

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**Author:** ![d6chung](https://avatars.discourse-cdn.com/v2/letter/d/d07c76/32.png) [@d6chung](https://forums.visual-paradigm.com/u/d6chung)\
**Post date:** [February 24, 2011, 4:41am UTC](https://forums.visual-paradigm.com/t/class-diagram-issue/11698/2 "2011-02-24T04:41:22Z")

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Software modelling cannot be generalised because you model specifically for your system. No one can say that it would generally make sense to have a so-and-so class in your class diagram – it all depends on your domain.

An “anonymous user” sounds like an instance of a user class. If that’s the case, you would have a user class and if you really need to constrain your model to have exactly one anonymous user, you can specify that using something like OCL.