Concept
The reliability of Wikipedia concerns the validity, verifiability, and veracity of Wikipedia and its user-generated editing model, particularly its English-language edition. It is written and edited by volunteer editors who generate online content with the editorial oversight of other volunteer editors via community-generated policies and guidelines. This editing model is highly concentrated, as 77% of all articles are written by 1% of its editors, a majority of whom have chosen to remain anonymous. The reliability of the project has been tested statistically through comparative review, analysis of the historical patterns, and strengths and weaknesses inherent in its editing process. The online encyclopedia has been criticized for its factual reliability, principally regarding its content, presentation, and editorial processes. Studies and surveys attempting to gauge the reliability of Wikipedia have mixed results. Wikipedia's reliability was frequently criticized in the 2000s but has been improved; it has been generally praised in the late 2010s and early 2020s. Select assessments of its reliability have examined how quickly vandalism—content perceived by editors to constitute false or misleading information—is removed. Two years after the project was started, in 2003, an IBM study found that "vandalism is usually repaired extremely quickly—so quickly that most users will never see its effects". The inclusion of false or fabricated content has, at times, lasted for years on Wikipedia due to its volunteer editorship. Its editing model facilitates multiple systemic biases: namely, selection bias, inclusion bias, participation bias, and group-think bias. The majority of the encyclopedia is written by male editors, leading to a gender bias in coverage, and the make up of the editing community has prompted concerns about racial bias, spin bias, corporate bias, and national bias, among others. An ideological bias on Wikipedia has also been identified on both conscious and subconscious levels.
