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IMO, the QA process should
eventually encompass all of XOOPS: core, "core" modules, other modules, themes, language packs, and so on.
But it may be expedient to pick one area, such as modules, or even a single module, to get started. After a complete QA process has been defined for that area, then we can review it, evaluate its effectiveness, and discuss how to expand it to cover more areas.
This is only my opinion. If someone has a better idea, I'm open to suggestions.