This chapter identifies the nature of the ‘five techniques’ of interrogation used during the State of Emergency in Aden. The threat from nationalist insurgents led not only to the declaration of a State of Emergency, but to the use of the ‘five techniques’ as well. In order to explain how such controversial techniques came to be used in this case the history and development of the techniques is addressed, as is the process of decision-making that led to their use. The reasons why the military brought these techniques to Aden will be made clear. It will be shown that the purpose behind the use of the ‘five techniques’ in Aden was to improve the intelligence available to the security forces.