The development policy defines how Wikimedia software is developed and maintained. This includes MediaWiki core, the bundled skins and extensions, as well as other skins and extensions that are deployed on Wikimedia Foundation wikis.
All Wikimedia engineering endeavors are guided by the Architecture Principles.
Creation of new services that add functionality to MediaWiki, should follow the related guidelines.
Changes to MediaWiki core that deprecate or remove aspects of the public PHP interface, must follow the Deprecation policy.
Changes to PHP support in MediaWiki core or components bundled with official MediaWiki releases, must follow the Support policy for PHP.
Privileged Gerrit users must follow the Gerrit privilege policy when exercising their +2 rights.