This manual is about interrogation operations. The purpose of this chapter is to define the interrogation mission and its critical elements; describe battlefield operations, IEW operations, and the intelligence processes, disciplines and the mission, enemy, troops, terrain and time available (METT-T) factors that shape and drive the interrogation process. It also addresses the personal qualities and special areas of knowledge of the interrogator and the capabilities and limitations of interrogation. It includes information on the various levels of conflict, interrogation missions, intelligence preparation of the battlefield (IPB) and the intelligence cycle. The level of detail is structured to assist you in understanding the interrogation tactics, techniques and procedures described in the remainder of the manual.