American Economic Review , Dortman and Steiner, 1962. In the final analysis of the marketplace, the quality of a product depends on how well it fits patterns of customer preference. Kuehn and Day, Harvard Business Review , 1962. Quality is fitness for use. Phil Crosby, Quality is Free .
Quality is the degree to which a specified product conforms to a design or specification.
H.L. Gilmore, ibid.