text: FM 2-22.3 _________________________________________________________________________________
  SOURCE ANALYSIS
  12-11. Source analysis involves the actions taken to determine if information
  from a single human source is internally consistent based on factors such as
  placement and access of source, prior information from the source, and
  existing holdings. Source analysis is used to determine if the information
  from a source is complete, truthful, and responsive to collection
  requirements. Preliminarily source analysis is the responsibility of the
  individual HUMINT collector.
  12-12. The HUMINT collector evaluates all source statements within the
  context of the information known about the source and the current situation
  to determine both the veracity and the validity of source statements. That is
  not to say that the HUMINT collector ignores any information that does not
  fit into expected pattern; rather that he treats that information with
  skepticism and uses appropriate questioning methodology to validate the
  statements (see Chapter 9). Source analysis is supported by the HCT leader,
  the OMTs, and the HOC. Each echelon reviews the intelligence and
  operational reports, identifies inconsistencies, evaluates veracity, and recom-
  mends additional lines of questioning as appropriate.
  12-13. Analysts can assign an alphanumeric designator to collected
  information based on an analyst’s determination of the reliability of the
  source and the probable accuracy of the information reported. A letter from A
  to F is assigned reflecting the level of reliability, with A representing the
  highest degree of reliability. The letter designation is then coupled with a
  number from 1 to 6. The number 1 represents confirmed intelligence and the
  numbers 2 through 6 represent increasing degrees of uncertainty as to the
  veracity of the information. A complete explanation if this rating system is
  contained in Appendix B. [NOTE: This system of labeling the reliability of
  sources and their reported information should not be confused with the
  alphanumeric rating scheme for source-screening operations as described in
  Chapter 6.]
  SINGLE-DISCIPLINE HUMINT ANALYSIS AND PRODUCTION
  12-14. Single-discipline HUMINT analysis involves the actions taken to
  evaluate the information provided by all HUMINT sources at a given echelon
  to determine interrelationships, trends, and contextual meaning. While
  called “single discipline," the analyst reviews and incorporates, as necessary,
  information from other disciplines and all-source analysis to provide a
  contextual basis for the HUMINT analysis. Single-discipline HUMINT
  analysis is conducted primarily by the HAT of the ACE. HUMINT operations
  sections and OMTs also conduct analysis to a lesser degree, based on the
  information from HUMINT sources at their echelon.
  12-15. Analysis does more than simply restate facts. The analyst formulates
  a hypothesis based on available data, assesses the situation, and explains
  what the data means in logical terms that the user can understand. There
  are two basic thought processes used by analysts to study problems and
  reach conclusions: induction and deduction.