In the absence of such ad hoc solutions, the EU is considered incorrect only on the particular points of contradiction.The Expanded Universe is actually older than the films themselves, as the novelization of the original film was published six months before the film was released.Some of these creatures have made it into film, while others, because of the way stories unravel, have not (so far). For once something is created, no matter what the context, it takes on a life of its own." A turning point was reached when West End Games began publishing the Star Wars roleplaying game in 1987.In order for players of the roleplaying game to create new adventures, West End Games needed to provide supplemental material describing the Star Wars universe in previously unknown detail and to make it self-consistent and coherent.[…] Since our movies have their own internal continuity, we maintain that in the spin-off works.Technically, George Lucas has been doing continuity all along by mapping out the nine films.
But these were not stories that I was destined to tell.But it wasn't until 1991, when Timothy Zahn wrote the novel Heir to the Empire, the first Star Wars best-seller, which was the beginning of what we call the Star Wars renaissance, that continuity became an issue." The early development of the Expanded Universe was sporadic and unrefined, in large part because, at this time, there was so little canon material for the creators to use as reference.The Expanded Universe is generally considered to have begun with Alan Dean Foster's February 1978 Star Wars spin-off novel, Splinter of the Mind's Eye, although technically it began in October 1977 with the story The Keeper's World, in Marvel Comics' Pizzazz magazine.The general rule was that nothing in the Expanded Universe was allowed to contradict any other part of the Expanded Universe or the films.The films, however, do slightly contradict the Expanded Universe on occasion, and retcons were created in the Expanded Universe to fix these contradictions.