Based on the Seven Sampling Errors of Pierre Gy.
Statisticians are well trained in sampling techniques if the sample is well defined.
Examples of such samples include industrial parts in manufacturing, invoices in business processes, and people in surveys. Author Patricia L. Smith illustrates what to look for in sampling devices and procedures to obtain correct samples from bulk materials. She gives sampling guidelines that can be applied immediately and shows how to analyze protocols to uncover sampling problems. Smith presents the ideas of Pierre Gy in lay terms so that his concepts and principles can be easily grasped and applied. She conveys Gy's intuitive meaning while preserving his original ideas.