Wikipedia carries the general disclaimer that it can be ' edited by anyone at any time' and maintains an inclusion threshold of ' verifiability, not truth'. 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, with findings varied and inconsistent.
