In the English version of the online encyclopedia Wikipedia, notability is a criterion to determine whether a topic merits a separate Wikipedia article. It is described in the guideline "Wikipedia:Notability". In general, notability is an attempt to assess whether the topic has "gained sufficiently significant attention by the world at large and over a period of time"[1] as evidenced by significant coverage in reliable secondary sources that are independent of the topic".[2] The notability guideline was introduced in 2006 and has since been subject to various controversies.