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Intelligence source and information reliability
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<p>Intelligence source and information reliability rating systems are used in <a href="/facts/Intelligence_analysis/BHJdNEEB">intelligence analysis</a>. This rating is used for information collected by a human intelligence collector. This type of information collection and job duty exists within many government agencies around the world. </p><p>According to Ewen Montagu, <a href="/facts/John_Henry_Godfrey/YNJ8XvPX">John Godfrey</a> devised this system when he was director of the <a href="/facts/Naval_Intelligence_Division_(United_Kingdom)/CjmhyzYQ">Naval Intelligence Division</a> (N.I.D.) around the time of World War II. </p><p>The system employed by the <a href="/facts/United_States_Armed_Forces/NHVsU9Id">United States Armed Forces</a> rates the reliability of the source as well as the information. The source reliability is rated between A (history of complete reliability) to E (history of invalid information), with F for source without sufficient history to establish reliability level. The information content is rated between 1 (confirmed) to 5 (improbable), with 6 for information whose reliability can not be evaluated. </p><p>For example, a confirmed information from a reliable source has rating A1, an unknown-validity information from a new source without reputation is rated F6, an inconsistent illogical information from a known liar is E5, a confirmed information from a moderately doubtful source is C1. </p><p>The evaluation matrix as described in the <a href="/facts/U.S._Army_Field_Manuals/w2VJo45g">Field Manual</a> FM 2-22.3 (see also <a href="/facts/Admiralty_code/2ze7bAVS">Admiralty code</a>): </p>