If a proposal fails, the failed tag should not usually be removed. It is typically more productive to rewrite a failed proposal from scratch to address problems than to re-nominate a proposal.
An accepted policy or guideline may become obsolete because of changes in editorial practice or community standards, may become redundant because of improvements to other pages, or may represent unwarranted [[Wikipedia:Avoid instruction creep|instruction creep]]. In such situations editors may propose that a policy be demoted to a guideline, or that a policy or guideline be demoted to a [[Template:Supplement|supplement]], [[Template:Infopage|informational page]], [[Template:Essay|essay]] or [[Template:Historical|historical]] page. In certain cases, a policy or guideline may be [[Template:Superseded|superseded]], in which case the old page is marked and retained for historical interest.