Nowadays, propellants, explosives and pyrotechnics are composed mainly of particulate energetic materials. These are gaining in importance as a way to optimize the performance, burning behavior, stability, detonation properties, processing characteristics and, above all, the low sensitivity of these systems. By varying the characteristic profile of these materials, product design provides for particulate components specially optimized for the application in question. Well-known solid formation processes are often used to create particles of energetic materials, such as crystallization or precipitation, comminution or atomization. Although there is a certain amount of information available about these processes for particle syntheses or processing, there is currently a lack of detailed comprehension in some points, which is needed to be able to completely control the particle formation process or to make reliable predictions about the profile required by the user for the particles so created. Vital questions and tasks remaining for particle technology of energetic materials are the comprehensive characterization of particulate components, the experimental determination of the kinetics of particle formation processes, the influence of the manufacturing process on important particle characteristics, such as particle size distribution, morphology or polymorphy, the simulation and modeling of particle formation processes and particulate materials, as well as the creation of low-defect particles with regard to the sensitivity of propellants and explosives. This book is targeted at those working in industry, government or R&D, and involved in the fascinating field of energetic or other special materials. It will hopefully contribute to summarizing our current level of knowledge.