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An Approach for Development of Specifications for Quality Improvement

Summary: [This abstract is based on the author's abstract.]

An important task of a quality program is to understand the needs and/or expectations of customers and to provide products and services that meet those needs. Design engineers must translate these needs into technological or substitute characteristics, which are both measurable and able to satisfy customer needs. Target values and specification limits are generally available for quality characteristics. An approach for determining target values and specification limits based on the quality loss function concept of Taguchi is presented. The target values used should make the product less sensitive to factors that disturb its performance. Optimization models that develop specification limits based on the minimizing of total quality costs are presented. These costs include losses resulting from variation from the target, inspection, or measurement costs, and costs associated with nonconformance. The goal is to prevent problems and avoid inspection. For some processes, the optimal strategy could require the elimination of items with excessive variation. Acceptable limits of variation and specification must be selected.

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  • Topics: Standards, Quality Control, Process Management
  • Keywords: Quality improvement (QI), Target, Taguchi method, Design, Standards and specifications, Quality control (QC), Process improvement, Optimization
  • Author: Kapur, Kailash, C.
  • Journal: Quality Engineering