Synthesis of particles with tailored properties and modified surfaces has reached the forefront of researches in particulate systems. Among all the techniques to do so, dry coating of coarse particle with fine cohesive ones seems to be an industrially viable option. To deepen the fundamental understanding of dry coating process, I began my research as a PhD candidate in 2015. Both DEM simulation and experimental studies is used to attain this goal. The project collaborates with a R&D team at AstraZeneca, wherein the knowledge is needed to optimize the formulation of dry powder inhaler (DPI).