The present text concerns the micro-level (particle-level) perspective on the different stages of the granulation process. A range of the newest and advanced quantitative models is presented hereby introducing recent advances in wetting and nucleation modelling, and theory describing granule growth behaviour. The different bonding mechanisms and the strength of liquid bonded particles are emphasised and recent advances in simulation of wet granule breakage is reviewed. Further, some of the more advanced coalescence models are introduced with primary focus on class I models accounting for coalescence of non-deformable as well as deformable granules
