Companies that process powders, granules, and other dry bulk solids often use multiple processes steps, such as size reduction mills, classifiers, mixers and dryers, conveying systems and baggers. As many companies have experienced, changing one piece of equipment or even equipment settings can lead off spec product. That’s one reason a company needs to conduct material, process and equipment test when planning to make new products, change existing processes or add more equipment to increase capacity. This article reviews some important factors to consider when selecting a company to conduct testing with.