text: FM 2-22.3 _________________________________________________________________________________
  7-12. When conducting military source operations, the location of the
  questioning will have psychological effects on the source. The questioning
  location should be chosen and set up to correspond to the effect that the
  HUMINT collector wants to project and his planned approach techniques.
  For example, meeting in a social type situation such as a restaurant may
  place the source at ease. Meeting in an apartment projects informality while
  meeting in an office projects more formality. Meeting at the source’s home
  normally places him at a psychological advantage, while meeting in the
  HUMINT collector’s work area gives the collector a psychological edge. The
  HUMINT collector should consider the status and level of the source,
  security, the workspace available, furnishings, the amount of lighting
  provided, and the ability to heat or cool the room as needed.
  TIME
  7-13. Time to conduct questioning should be estimated based on the source,
  the type of information that the HUMINT collector expects to get, and the
  complexity of that information. Other considerations include expected
  evacuation times for sources in tactical situations, the number of other
  sources that need to be spoken to; and in contact operations, the estimated
  time that the HUMINT collector can meet with the source without increasing
  the risk.
  7-14. The HUMINT collector must also consider the physical conditions of
  the source and himself. After extended operations, there may be a limit on
  how long either the HUMINT collector or source can concentrate on a given
  subject. Even if the HUMINT collector has an unlimited time period (such as
  at a joint interrogation and debriefing facility), he must break his
  questioning down into topical sessions to maximize effectiveness. Time is
  only an estimate and should be modified based on the circumstances. It may
  be extended, for example, if the source has a greater than expected amount of
  information, or critical information in unforeseen areas. The time may be
  curtailed if the HUMINT collector has met his requirements, the source does
  not possess the expected information, or a more valuable source is identified.
  PRIMARY AND ALTERNATE APPROACHES
  7-15. In most circumstances, if the HUMINT collector is meeting with the
  source for the first time, he should select at least two alternate approaches to
  use if the direct approach is unsuccessful (see Chapter 8). These approaches
  need to be based on the HUMINT collector's source-specific research, his
  general area research, knowledge of the current situation, and knowledge of
  human nature. There are four primary factors that must be considered when
  selecting tentative approaches:
  • The source's mental and physical state. Is the source injured, angry,
  crying, arrogant, cocky, or frightened?
  • The source's background. What is the source's age and level of military
  or civilian experience? Consider cultural, ethnic, and religious factors.
  • The objective of the HUMINT collection. How valuable is the source’s
  potential information? Is it beneficial to spend more effort convincing
  this source to talk?