The first installment of this two-part discussion concluded by stating a single linear measurement (i.e.. circular equivalent diameter) may not be adequate to describe a tj^ical non-spherical particle with some degree of surface roughness. There are various definitions and several standardized shape factors available that can provide additional descriptors to a particle population of interest. These valuable shape descriptors can be measured using image analysis. There are numerous examples of how the shape of the particle may influence its behavior, or at least, correlate to a response of interest. Because of this importance, shape factors may be necessary to consider in validated characterization methods. In Part II, case studies are given that illustrate the importance of shape factors and how they may be used to solve various problems.