The degree of closeness of a measurement of a quantity to that quantity's true value. Accuracy Definition adapted from Wikipedia. See http://en.wikipedia.org/wiki/Accuracy_and_precision Method detection limit Definition adapted from Wikipedia. See http://en.wikipedia.org/wiki/Detection_limit. The minimum concentration of a substance that can be distinguished from the absence of that substance within a stated confidence limit (generally 1%) given a particular analytical method. Reporting level The smallest concentration of analyte that can be reported by laboratory. This describes a numeric value below which measured values should be considered suspect. This numeric value should be empirically derived. Physical limit lower bound Precision Definition adapted from Wikipedia. See http://en.wikipedia.org/wiki/Accuracy_and_precision The degree to which repeated measurements under unchanged conditions show the same results. Physical limit upper bound This describes a numeric value above which measured values should be considered suspect. This numeric value should be empirically derived. ODM2 Working Group A vocabulary for describing the type of data quality information provided for a particular Result. Examples include the accuracy or precision of the data values within the Result. ODM2 Controlled Vocabulary Data Quality Type CV