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the U.S. Government. Certain quotations from this paper will show the importance that our government places on quality control:.

"The contractor shall develop and maintain an effective and economical quality control system. The quality control system shall assure that adequate inspection coverage is maintained throughout the entire process of manufacture, including packaging and shipping. Evidence of required inspection shall be provided by the contractor prior to submission for acceptance. Objective evidence will be evaluated and verified by the consumer representative."

It is important here that it is up to the supplier to develop, maintain and prove this system of guality control. The word "economical" is used and implies a system of acceptance sampling or control charts.

Acceptance sampling is used to determine as economically as possible whether material is of acceptable quality. There are many kinds of sampling all based upon mathematical statistical theory, but requiring only a knowledge of arithmetic by the inspector using them. Perhaps the simplest is described in Mil-Std-105A. Sampling serves as the best compromise between lW/o grading and an educated guess, as it gives a calculated risk.

Control charts are used primarily to determine if a machine or process is producing as it should. These charts are useable only on long runs. Control charts were devised by statisticians but are quiie simple to use and have many applications in business and industry. Perhaps the best description of their use is the Grant's book.

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The quality control system is a system for making decisions relative to the quality status of a product. Trvo important parts of a quality control system are the acceptance sampling and control charts. These aid in achieving the objective of the quality control system, this is the prevention of defective merchandise.

A successful quality control department will prevent the delivery of such low-grade lumber as will lose customers, cause excessive complaints or rejected material. It will also prevent the delivery of a grade too high for its use.

If the system is properly set up and working as it should, it will give warning of anticipated trouble in customers relations, show the underlying cause of wasteful production, lower the costs of reinspection, lower the amount of scrap and rework.

It will also yield a more uniform product, give quality assurance, promote a more efificient use of material and give better customer relations.

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REFERENCES:

Bowker, A. H. and Goode, H. P., Sampling Inspection by Variablcs, McGraw Hill Book Co. 1952

Coleman, Edward P., Acceptance Inspection and Quality Reports to Management, U.C.L.A. (unpublished), 1954

Department of Defense, Sarnpling Procedure and Tables for Inspection by Attributes (Mil-Std-lOSA), U.S. Government Printing Office, Washington, D.C. 1950

Dodge, H. F. and Romis. H. G.. Sampling Inspection Tables, John Wiley and Sons. Inc., London 1944

Duncan, A. J., Quality Control and Industrial Statistics, Richard D. Irwin, Inc., Chicagp 1952

Grant, E. L.. Statistical Quality Control, McGraw-Hill Book Company, Inc.. New York 1952

Grant. E. L. and lreson, W. G., Handbook of Industrial Engineering and Management, Prentice Hall. Englewood Clifis, 1955

Wald. A., Selected Papers in Statistics and Probability, McGraw Hill Book Co., Inc., New York 1955. (Not recommended for reading without knowledge of calculus and probability theory.)