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This is amaintenancecategory, used formaintenance of the Wikipedia project. It is not part of the encyclopedia and containsnon-article pages, or groups articles by status rather than subject. Do not include this category in content categories (except foreponymous maintenance categories).

This is atracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of theencyclopedia's categorization scheme.

• This category ishidden on itsmember pages—unless the correspondinguser preference (Appearance → Show hidden categories) is set.
• These categories can be used to track, build and organize lists of pages needing "attentionen masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience.
• These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).

This category combines all Wikipedia articles needing clarification from May 2011(2011-05) to enable us to work through the backlog more systematically. It is a member ofCategory:Wikipedia articles needing clarification.
To add an article to this category add{{Definition needed|date=May 2011}},{{Definition|date=May 2011}},{{Confusing|date=May 2011}}, {{Clarify span|date=May 2011}}, {{Clarify|date=May 2011}} or {{Ambiguous|date=May 2011}} to the article. If you omit the date abot will add it for you at some point.

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• Clean-up categories from May 2011