Six Sigma Solutions
Design for Six Sigma (DFSS) builds quality into a product. By assessing the variations that a product experiences during manufacture and use, it is possible to optimize a product that performs its intended function regardless of these variations; such a product is “robust,” and, therefore, Design for Six Sigma is sometimes called Robust Design. Design for Six Sigma is an analysis technique used to determine the extent to which uncertainties in the model affect the results of an analysis. Based on a probabilistic characterization, Design for Six Sigma enables users to quantify the quality of a product by addressing issues such as minimizing warranty costs and assessing the reliability of the product. DFSS goes one step further than a probabilistic characterization by allowing users to optimize design variables to achieve a particular probabilistic result such as Six Sigma, which, including long-term effects, is 3.4 failures in one million parts. Six Sigma initiatives attempt to optimize the manufacturing process so that it automatically produces parts conforming to Six Sigma quality. In contrast, DFSS optimizes the design itself so that the part conforms to Six Sigma quality even with variations in manufacturing. Quality is an explicit goal of the optimization.
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