NORMAND L. FRIGON is a partner in the business consulting firm of Delta Performance Group. His firm provides cutting-edge consulting services and training throughout industry in all aspects of product, process, and services optimization and management. He is the coauthor of Management 2000, From Concept to Customer, Achieving the Competitive Edge, and The Leader.

DAVID MATHEWS, PhD, is the chief engineer of Delta Performance Group. He is a consultant in product design and process optimization, specializing in new applications for statistical comparison techniques. He is an instructor in seminars at major universities and a technical advisor to engineers and statisticians. He also teaches at West Coast University and is a former adjunct associate professor in both the mathematics and physics departments at the University of Alabama in Huntsville. He is a member of the Eta Kappa Nu and Sigma Xi honor societies.