Deletionism and inclusionism are opposing philosophies that largely developed and came to public notice within the context of the community of editors of the online encyclopedia . The terms are connected to views on the appropriate scope of the encyclopedia, and the appropriate point for a topic to be allowed to "include" an encyclopedia article (i.e., "inclusion") or "delete" the article (i.e., "deletion"). Inclusionism and deletionism are broad terms falling within a spectrum of views. The concepts are closely related to , with deletionists and inclusionists taking a strong or relaxed stance on "notability" respectively. Many users do not identify strongly with either position.
To the extent that an official stance exists at 2010, it is that "There is no practical limit to the number of topics it can cover" but "there is an important distinction between what can be done, and what should be done", the latter being the subject of the policy "". The policy concludes "Consequently, this policy is not a free pass for inclusion".
At the end of each debate, an administrator judges the community consensus. Articles that do not require debate can be flagged and deleted without debate by administrators. If the administrator's decision is disputed, then the discussion can be taken to "deletion review," where the community discusses the administrator's decision. In controversial cases, the debates can spread to other places on the Internet.
According to veteran contributor Geoff Burling, newer members are less likely to have helped delete articles that should have been kept on hindsight, and so exercise less caution. Journalism professor K.G. Schneider has identified the mentality of deletionism as having manifested once the emphasis of the encyclopaedia shifted from quantity to quality.
Documentarian Jason Scott has noted the large amount of wasted effort that goes into deletion debates. Deletion debates may contribute to community disintegration, restriction of information, or a decrease in the rate of article creation that suggests a decrease in passion and motivation amongst editors. Being explicitly called an inclusionist or deletionist can sidetrack the issue from the actual debate. Nevertheless, some have observed that the interaction between the two groups may actually result in an enhancement of overall quality of content.
Specific cases of disputes between deletionists and inclusionists have attracted media coverage.
In February 2007, the nomination of the Terry Shannon article for deletion was ridiculed by The Inquirer.