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Canon refers to the body of work that is considered to be "genuine" or "official" within a certain fictional universe.

In the case of the Grey's Anatomy verse, the only canon source of information is the television series itself. While the creators of Grey's Anatomy have never explicitly stated their views on the canonicity of the Grey's Anatomy novels, comics or games, we at Wiki Grey's Anatomy have chosen to accept information from all official sources of Grey's Anatomy story material. In the case of contradictory information, we utilize the following order of precedence to determine which facts are "true."

1. TV series - Information from the television show overrides contradictory facts from any other source.
2. Related spin-offs - Grey's Anatomy:Video Game is made with the participation of people involved in the TV show.
3. Website - The character profiles on the ABC website are a semi-official source of information, though they may be contradicted by the TV show at any time.
4. Other novels, comics & games - Other novels, comics and games are considered a form of "official" fan fiction. They are created without the participation of the show's creators, but as long as it doesn't contradict anything shown on TV, information culled from these stories is fit for inclusion in Grey's Anatomy and Private Practice Wiki.

In this list, information from a source higher on the list overrides information contradicting it lower on the list. For example, information from DVD's would be more reliable than a spin-off article such as a novel. In the case of contradictory information from two or more sources at the same level of canonicity, the newest source takes precedence.

Notes:

• Information from DVD deleted scenes and scripts are NOT considered canon. Episode credits and DVD closed captioning are also not canon sources of information, although they can be used to cull character names and spellings, provided there's no contradiction with any in-universe source. Articles can be created for non-canonical material, but they must be written from an out-of-universe perspective , such as the articles found in Category:Non-canon characters.

• Out-of-universe sources of information such as cast and crew interviews, trailers and Grey's Anatomy:The Official Magazine are secondary information sources, much like Wiki Grey's Anatomy and Private Practice Wiki itself, but are never to be considered canon. Only facts from in-universe sources are permitted in the main body of in-universe articles.