Quality is the degree to which a specific product satisfies the wants of a specific customer. H.L. Gilmore, Quality Progress , June, 1974. 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.