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5

A Very Simple Set of Process Control Rules*

Arnon M. Hurwitz

SEMATECH Austin, Texas

Mahesh Mathur Corning Inc.

Corning, New York

Abstract

A simple set of process control rules are suggested as an altemative to the use of the WECO rules. The simple rules compare favorably with the zonę control chart scheme. These new rules are easily implemented for use on the factory floor without loss of power of the statistical test.

Introduction

Any mathematical compIexity, however mi ld. hampers the use of control-charting on the shop floor. The traditional WECO rules (Western Electric Company Handbook, 1956) have, in these authors' opinion, been one of the main ♦A portion of this chapter is based on “Simple Process Control Rules Compared to WECO Rules,” by M. Mathur and A. M. Hurwitz, Quality Engineering, vol. 5, no. 6, pp. 21-29.

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