The present book is based on the experience of sampling powders and bulk materials at institute of "Mechanische Verfahrens technik " , Karlsruhe University (Germany). sampling is understood to be the taking of samples from a material in order to obtain information about the composition of the total amount in respect of one or more attributes, such as metal content, ash content, moisture, particle size, particle shape etc. In the case of granular bulk material already comminuted or not, samples from tubs, trucks, bags or barrels. As granular material has a strong tendency to segregate, portions must be removed form these containers at many places. The book describes the basic theory behind sampling materials in powder or granular form. In addition to providing fundamental statistical data, it also highlights the mistakes that can arise in the different types of sampling techniques, such as suspensions, pellet cross-sections, sample dividing, or sampling according to number or weight. If the samples contain individual particles, comparable in size to the size of the sample itself then in addition to the number of individual elements in the sample and the type of sampling the particle size and particle size distribution will be further variables. This book will pay special attention to this fact important for the whole of powder technology, the chemical, pharmaceutical, food and and for mineral processing industry.