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With arMS you create categories, then under each category you can create sections and then add articles to each section, e.g.
Outdoor Activities > Outdoor Games > Mountain Games
What I think is cool is that each 'article' can be built up of pages submitted by different users. The title and author of each page is listed at the top of the article as links. So your Mountain Games article could have a page called 'Climbing' submitted by Orestis and another called 'Falling Off' submitted by Peekay (excuse my ignorance of playing properly with mountains!).
The article as a whole can be cross referenced, so it could appear in another section called 'Dangerous Sports'. You can sub-categorise even more using 'levels' too, but I haven't worked out how that works yet.
If you haven't used it before, my tips, based on today's cursing and struggling, are:
1) In main arMS admin, create categories, then sections, then select the 'levels' link and create at least one level (I just called it Level1). Select the 'moderators' link and add a section moderator too.
2) Articles are added using the arMS 'Add Article' side menu link, not the article management screen.
3) After you have added pages to it, to actually see an article, take it off 'Hold' in the edit article screen first, then select 'My Articles' from the sidebar menu and click the padlock button in the list to activate it.
I like it.
But sadly, I don't think it's supported.