The 0.1 version can be as simple as this:

MediaWiki Core

• Area 1
• Area 2
• ...

Key extensions

• Extension 1
• Extension 2
• ...

The list of extensions should be really short, probably focusing in those providing an API and/or defining the basic "Wikipedia experience".

The bug summary is unclear: there is https://www.mediawiki.org/wiki/Manual:MediaWiki_architecture , so it would be a WORKSFORME. From what I understand, you're looking for a grouping of components. The currently available grouping for extensions is https://www.mediawiki.org/wiki/Category:Extensions_by_category

Classes can be grouped via @ingroup/@defgroup in the doc comment; the result is this list.

In T1287#1358252, @Tgr wrote:

this list.

VERY interesting, thank you. That list contains 30 modules, which is better than the 42 rows of https://www.mediawiki.org/wiki/Developers/Maintainers#MediaWiki_core

A list based on modules is good because it is objective and discreet. Some of those 30 probably don't need to be listed in a high level picture? For instance, "PHP known bugs tests".

I'm marking this task tentatively for ECT-July-2015. Ones someone puts enough focus on this task, it shouldn't be that difficult to come up with a first satisfactory version.

In T1287#1358252, @Tgr wrote:

Classes can be grouped via @ingroup/@defgroup in the doc comment; the result is this list.

Conversely, these doc comments are missing some important groupings, e.g ResourceLoader.

@Aklapper and I discussed this and T115852 briefly. It seems the best short- to mid-term fix is update https://www.mediawiki.org/wiki/Developers/Maintainers to add Architectural area and WMF team columns and make it sortable. To provide the overview without scrolling through the table, there could be table rows for each architectural area that show up in the TOC, or perhaps there's a way to have collapsible subsections of a sortable table.

cc'ing @Legoktm here as he offered to take on the parent task of this (T128370) and there are good ideas here about how/what groupings.

This project is selected for the Developer-Wishlist voting round and will be added to a MediaWiki page very soon. To the subscribers, or proposer of this task: please help modify the task description: add a brief summary (10-12 lines) of the problem that this proposal raises, topics discussed in the comments, and a proposed solution (if there is any yet). Remember to add a header with a title "Description," to your content. Please do so before February 5th, 12:00 pm UTC.

@Jrbranaa is this related to what you're doing about ownership for Release-Engineering-Team ?

@Catrope, yes I think this is related.

The work on defining stewards for each item will help, but I think we'll need to evolve the developer/maintainers page some more to make it more consumable. Even with the changes that have been made to the page and the identification of stewards, I think it will still fall short of addressing the pain points that are identified.

Thanks for looping me in.