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BriefResearch and theoretical speculations concerning the human link as one source of vulnerability in military comnuaiation systems is high-lighted. The following factors were conrerned:Characteristics of the message, including amount of information and readability.2. The physical environments with specific reference to noise, atmospheric and thermal conditionsa and stress including isolation and confinement. 3.Characteristics of the human operator including sensory# perceptual aWr intellectual capacities; vigilance and susceptibility to fatigue; training and memory; social, motivational and personality factors; and psychopathology.