The book contains lectures of an international NATO-Russian Advanced Research Workshop about Detection and Disposal of Improvised Explosives used by terrorists. The ARW was an event of a series of workshops before, dealing with detection of explosives by different analytical methods and different shape and compositions of the explosive charge. The formulation 'Improvised Explosive', IE, is a new expression for terrorist explosives, which were produced mostly by knowledgeable laymen in a home-made manner. IE can be any chemical compound or mixture of commercial substances, capable of an explosive reaction after initiation by a detonating device. The disposal of such IE is connected with a special danger, because IE are in many cases much more unstable and mechanically more sensitive than commercial or military explosives.