The uncertainty of a measurement is the "Parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand " where the measurand refers to the item being measured. In other words, the uncertainty of a measurement result reflects our lack of exact knowledge of the value of that item.		References in this course: M1L4T2, p. 1/14; M3L1T2, P.3/29
An uncertainty budget is "a systematic method for estimating the limit of error or uncertainty for a measurement.  In this method, one lists all known sources of error that might affect the measurement result.  In the traditional method, a theoretical analysis of sources of error is made to provide estimates of the expected variability."		References in this course: M1L4T2 Subtopic 1, p. 4/20





