The two different methods of persuasion and suggestion are described, and the difference between conscious and subconscious processes is explained. Some characteristics of altered states of consciousness are listed, including changes in thinking, time distortions, loss of control, changes in emotional reactivity, changes in body image, and perceptual distortions. Key factors for increased suggestibility are outlined, several principles of suggestions which may operate during communication are described, and differences between waking and hypnotic suggestions are explained. Also covered is the relationship of neurolinguistic functioning and suggestiblity. Suggestibility techniques are given to fixate the hostage taker's attention, to depotentiate normal habits, to initiate subconscious cues, and to reinforce positive responses. The article concludes that because the hostage taker and hostage are already in an altered state of consciousness, the negotiator is provided with an advantage. By using suggestibility techniques, the negotiator adds an increment of influence in defusing, shaping, and ultimately resolving a life-threatening crisis. A table and 22 references are appended.