The key objective of this area is to use the microscopic design of particles and interfaces to adjust the macroscopic properties and structures of particulate systems and to tailor the processes and unit operations dealing with solid particles. Based on the physico-chemical understanding of particle interactions and forces at the molecular and microscopic level, processes of particle attrition and agglomeration as well as electrification and charge control processes are examined across all hierarchical levels, whereby interface controlled process may play a major role in the understanding of the phenomena.