analysis of the situation, and careful thought about what exact words to use and the tone of voice in which to use them. Classified thesis Headley's thesis entitled "The Psychological Subversion of Trusted Systems" was classified by the DOD in 1984 and so far has not seen the light of day. As a result, further information about PsychSub is generally unavailable outside of Headley's own seminars on the subject during the 1980s at CIA technology and spycraft-type seminars such as Surveillance Expo. References (1) Headley's talk at a hacker convention in Las Vegas Deception Psychological abuse Social engineering (computer security)