Hi John! I agree a UI mockup would be informative. I'm not sure how soon I'll find time to make one. (In any case it would be speculative -- until we try a UI in a real system, we won't really know whether it's any good. Also I think there would always be niche-specific UI variants. So the mockup would be about a basic UI to get started with.) In the meantime I added a [user story](https://github.com/oresmus/collaborative-design-wiki/wiki/user-story:-UI-for-topic-classifying-items) (more or less) about assigning topics to posts and comments. I should add more user stories, and I'm working on another article about applying OPSN to development of code. (There is also a wiki page listing additional explanations or diagrams people have asked for, [FAQ-about-OPSN](https://github.com/oresmus/collaborative-design-wiki/wiki/FAQ-about-OPSN).) If anyone has a specific question like "how would you do *this* action, or represent *this* relationship, or see *this* overall structure, or solve *this* problem?" I could try to write something which addressed that specifically.