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In the [[English Wikipedia]], '''verifiability''' means other people using the encyclopedia can check that the information comes from a [[Wikipedia:Reliable sources|reliable source]]. Its content is determined by previously published information rather than editors' beliefs, opinions, experiences, or [[Wikipedia:No original research|previously unpublished ideas or information]]. Even if you are sure something is true, it must have been previously published in a reliable source before you can add it.{{efn|This principle was previously expressed on this policy page as "the threshold for inclusion is '''verifiability, not truth'''". See the essay, [[Wikipedia:Verifiability, not truth]].}} If reliable sources disagree with each other, then maintain a [[Wikipedia:Neutral point of view|neutral point of view]] and present what the various sources say, giving each side its [[Wikipedia:Neutral point of view#Undue weight|due weight]].
In the [[English Wikipedia]], '''verifiability''' means other people using the encyclopedia can check that the information comes from a [[Wikipedia:Reliable sources|reliable source]]. Its content is determined by previously published information rather than editors' beliefs, opinions, experiences, or [[Wikipedia:No original research|previously unpublished ideas or information]]. Even if you are sure something is true, it must have been previously published in a reliable source before you can add it.{{efn|This principle was previously expressed on this policy page as "the threshold for inclusion is '''verifiability, not truth'''". See the essay, [[Wikipedia:Verifiability, not truth]].}} If reliable sources disagree with each other, then maintain a [[Wikipedia:Neutral point of view|neutral point of view]] and present what the various sources say, giving each side its [[Wikipedia:Neutral point of view#Undue weight|due weight]].


All material in [[Wikipedia:Mainspace|Wikipedia mainspace]], including everything in articles, lists, and captions, must be verifiable. Additionally, four types of information are required to be followed by an [[WP:INCITE|inline citation]] to a reliable source that directly supports{{efn|name="directly supports"}} the material. The four types are:
All material in [[Wikipedia:Mainspace|Wikipedia mainspace]], including everything in articles, lists, and captions, must be verifiable. Additionally, four types of information