This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories. This is a tracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme. This category is hidden on its member pages—unless the corresponding user preference (Appearance → Show hidden categories) is set. These categories can be used to track, build and organize lists of pages needing "attention en 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).

Administrators: Please do not delete this category as empty! This category may be empty occasionally or even most of the time.

If this category has 20 items or more, it will be reported as a backlog. (recount)

These are articles that require attention to some of the measurements in the article, often supplying a conversion of measurement in addition to the current version (usually, but not always, to metric). When the work has been done please remove the category or template. See Wikipedia:Manual of Style (dates and numbers)#Units of measurement.

Articles can be added using ((Metricate)) or ((Unit-attn)).