Comparing Acceptance Sampling Standards, Part 2
- Quality Engineering
- April 2013
- Volume 25 Issue 2
- pp. 181-187
- Neubauer, Dean V., Luko, Stephen
In Part 1 of this two-part series, common attribute sampling standards were discussed and compared. Attribute sampling standards date back to the 1930s and the original work of Harold F. Dodge and others at Bell Labs. Today's attribute standards (ANSI/ASQ Z1.4, ASTM E2234, ISO 2859) find their common heritage in the older Military Standard 105 series. In this article, the discussion will shift to the development of variables sampling standards which find their linkage to a military standard as well—Military Standard 414. Like MIL-STD-105, MIL-STD-414 has derivative standards as well which are in use today. This article will serve to discuss and compare these derivative standards in the manner in which attributes standards were covered in Part 1. Once again we find that sampling schemes are not restricted to attributes. They may be composed of variables plans as well. Thus, it was that Military Standard 414 (MIL-STD-414) was issued on June 11, 1957. It has since become a classic companion standard to MIL-STD-105 and has been used throughout the world. The protection afforded by this standard is roughly matched to MIL-STD-105A. However, modifications in the tables incorporated in the MIL-STD-105D version upset the match somewhat. Commander Gascoigne of the British Navy showed how to restore the balance and his simple method has been incorporated into civilian sampling systems. The MIL-STD-414 sampling system will be discussed in depth here as an example of a classic variables system, and its relation to other systems, including MIL-STD-105E, will be indicated.