Existem níveis de canonicidade dentro do Universo Expandido de Star Wars - com precedência configurada de tal forma que tudo é 'canon' a menos que especificamente em desacordo com um nível mais alto.
Do artigo da Wikipédia sobre o universo expandido :
- G (George Lucas) canon is absolute canon. This category includes the final releases of the six films, the novelizations of the films, the radio dramas based on the films, the film scripts, and any material found in any other source (published or not) that comes directly from George Lucas himself. G canon outranks all other forms of canon.
T (Television) canon, which currently comprises Star Wars: The Clone Wars and the as yet unaired live action Star Wars TV series. This level of canon is considered to take precedence over C canon (see below), possibly due to the fact that George Lucas is directly involved with these shows as executive producer, and in the case of The Clone Wars is also on the writing team. This level ignores the Genndy Tartakovsky Clone Wars series, though the CGI series dervives many moments from that one.
C (continuity) canon refers to the main body of EU work, and is the next most authoritative level of canon. All material published under the Star Wars label that doesn't fall into either G, T, S, or N canon is C canon and is considered authoritative as long as it isn't contradicted by G canon.
S (secondary) canon refers to older, less accurate, or less coherent EU works, which would not ordinarily fit in the main continuity of G and C canon. For example, this includes the popular online roleplaying game Star Wars Galaxies, and certain elements of a few N-canon stories.
N continuity material is also known as "non-canon" or "non-continuity" material. What-if stories (such as those published under the Infinities label) and anything else that cannot at all fit into continuity is placed into this category. "N-continuity" is not considered canon.
KOTOR é provável em algum lugar entre C e S canon. No entanto, apenas o enredo do lado da luz é canônico, com as terminações do lado negro provavelmente sendo N-canon.
Quanto à principal fonte de canonicidade - existe um banco de dados de continuidade chamado ' Holocron ' (após os dispositivos de armazenamento usados) no universo). É mantido pela Lucas Licensing, mas não está publicamente disponível.