|This page in a nutshell: Uninvolved administrators can revert to and protect an older version of an article, as a means of resolving disputes and halting disruption.|
The "stable version" is the most recent version of an article that has existed for any period of time without being contested or disrupted.
The term "stable version" is a concept that refers to the most recent version of an article that was not affected by an active content dispute or edit war. Restoring an article to the stable version when fully protecting it (in response to such a content dispute or edit war) is a common administrative practice that is authorized by the Protection policy. Restoring the stable version is not required or encouraged by any policy or guideline, and administrators can fully protect articles mid-dispute, even if the protected version contains controversial edits. However, doing so can upset editors who did not get their preferred version protected, and they may complain that the admin has protected "the wrong version". Reverting to the stable version returns the article to neutral ground, and thus may help de-escalate a situation better than protecting one party's preferred version would. Admins should consider what the best course of action is on a case-by-case basis, and neither option constitutes an admin's involvement in a dispute or an endorsement of the protected version of an article in any way. If an administrator does not restore the stable version, involved editors can still request that the stable version be restored by any administrator.
It is important to note that outside of the limited administrative context, a "stable version" is an informal concept that carries no weight whatsoever. Maintaining a stable version is, by itself, not a valid reason to revert or dispute edits, and should never be used as a justification to edit war. Stable versions are not superior or preferred to disputed edits in any way, and boldly making changes to articles is encouraged as a matter of policy. Editors involved in content disputes or edit wars should focus on resolving the dispute, rather than preserving the stable version.
Historically, the phrase "stable version" was used to refer to a wide variety of proposals to implement a formal system to identify and maintain good-quality versions of articles—keeping them "stable" from any potential unwanted changes. Such proposals included Stable versions, Stable versions now, Baseline revision, Stabilizing featured articles, Article validation, Reviewed versions, Community assent, Flagged revisions, and Pending changes. After many years of debate and controversy, the variation of these proposals known as pending changes protection was permanently implemented in December 2012 and remains in effect to this day. The term "stable version" is no longer used in this context.