[quality characteristic:] "A measured response that relates to a general or specific requirement that can be an attribute or a continuous variable. The quantifiable measure of performance that directly affects the customer’s satisfaction. Often in DFSS, these have to be converted to an engineering scalar or vector." (Clyde M Creveling, "Six Sigma for Technical Processes: An Overview for R Executives, Technical Leaders, and Engineering Managers", 2006)
"1. A characteristic of a software product used to judge or describe its quality. A software quality attribute can also be refined through several steps into partial attributes. 2. Ability or characteristic which influences the quality of a unit." (Tilo Linz et al, "Software Testing Foundations, 4th Ed", 2014)
"A feature or characteristic that affects an item’s quality." (IEEE 610)
"A set of attributes of a software product by which its quality is described and evaluated. A software quality characteristic may be refined into multiple levels of sub-characteristics (ISO 9126)
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