"What if those A-listers simply added an equity clause or an inclusion rider into their contract? Now, what does that mean? Well, you probably don't know but the typical feature film has about 40 to 45 speaking characters in it. I would argue that only 8 to 10 of those characters are actually relevant to the story. ( . . . ) The remaining 30 or so roles, there's no reason why those minor roles can't match or reflect the demography of where the story is taking place. An equity rider by an A-lister in their contract can stipulate that those roles reflect the world in which we actually live." - Stacy Smith at TEDWomen 2016
Inclusionism (noun inclusionist) is a Wikipedian philosophy advocating for editing Wikipedia articles, in addition to making there factual information valid. This is contrasted with Deletionism, which wants to delete multiple articles that are not famous or have invalid information (rather than edit to make valid).
Inclusionism is what makes Wikipedia every informative. Included multiple articles enables readers to attain an in-depth knowledge on a subject.