Exclusionism may be regarded by some as the opposite of deletionism or as an alternative philosophy. It is possible to be an inclusionist and an exclusionist at the same time.
Whereas deletionists simply wish to delete articles they see as poor, an exclusionist prefers to omit what they see as poor, superfluous or extraneous material in an article while retaining the article itself. They would only delete an article if they felt their omissions would leave nothing substantial.
Exclusionists make their decisions to exclude on grounds such as relevancy, article size, information already existing in another article, lack of references, and so on. They may also construct seemingly complete articles before publishing them, in the hope they will then be viewed as fait accompli.