2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153251A theory of measurement uncertainty is presented, which, since it is based exclusively on the Bayesian approach and on the subjective concept of conditional probability, is applicable in the most general cases. The recent International Organization for Standardization (ISO) recommendation on measurement uncertainty is reobtained as the limit case in which linearization is meaningful and one is interested only in the best estimates of the quantities and in their variances.9 pages, latex, to appear in the proceedings of the "1996 Joint Statistical Meetings"Data Analysis, Statistics and ProbabilityAstrophysicsHigh Energy Physics - PhenomenologyNuclear Experimenttext