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ASP, The Art and Science of Practice: In Search of the (sqrt) N + 1 Rule

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  • J. Frank Rudisill

    (Johnson College of Business and Economics, University of South Carolina Upstate, Spartanburg, South Carolina 29303)

Abstract

In over 25 years of consulting in operations research, management science, quality management, and statistics, I have come across several rules of thumb that practitioners use frequently, but incorrectly. One is the “square root of ( N ) + 1” rule used in sampling and inspecting raw materials and finished goods. This paper describes several of my encounters with this rule and the circumstances of its use. I discuss how I used a nested design experiment to demonstrate to users that the rule was not appropriate for their situations. The paper also includes a “top 10” list of other rules of thumb and beliefs that people often use incorrectly. I offer tips that have helped me avoid these rules.

Suggested Citation

  • J. Frank Rudisill, 2010. "ASP, The Art and Science of Practice: In Search of the (sqrt) N + 1 Rule," Interfaces, INFORMS, vol. 40(2), pages 154-158, April.
    • Handle: RePEc:inm:orinte:v:40:y:2010:i:2:p:154-158
    DOI: 10.1287/inte.1090.0461
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