If you only buy one book on the application of statistics and probability to the creation of control charts (SPC) and acceptance sampling, this is it. Dale wrote the original first text on SPC back when the only literature on the subject was found in periodicals and research papers. It took him over 3000 manhours to write this concise text and it's bank of clear, understandable problems. The text earned him the title of full Professor at Southern Illinois University and a national reputation as it was used by Ford Motor Company and others for internal training. After teaching from it for almost 20 years I can assure you there is no better book on the subject in the field. (And, yes, I know Dale personally, but have had virtually no contact with him since his retirement many years ago).