Normative Basis

ConCertainty is based on recognized international and national standards for measurement uncertainty determination and laboratory accreditation. This page provides a brief overview of the relevant standards and their role in ConCertainty.

GUM – Guide to the Expression of Uncertainty in Measurement

The GUM is the fundamental international document for determining and stating measurement uncertainties. It describes the general principles and methods on which measurement uncertainty determination is based.

In ConCertainty, the GUM forms the conceptual basis for calculating combined and expanded measurement uncertainty.

DIN ISO 11352 – Water Analysis

DIN ISO 11352 describes the estimation of measurement uncertainty on the basis of validation and quality assurance data. Among other things, it defines the terms and calculation procedures for reproducibility and comparability used in ConCertainty.

ConCertainty calculates measurement uncertainty according to the procedure described in DIN ISO 11352 – based on measurement series (reproducibility) and comparison values from certified reference materials or interlaboratory comparison participation (comparability).

ISO/IEC 17025 – Competence of Testing and Calibration Laboratories

ISO/IEC 17025 sets out the general requirements for the competence, impartiality, and consistent operation of laboratories. It is the basis for the accreditation of testing and calibration laboratories.

ConCertainty helps laboratories meet the requirements of ISO/IEC 17025 for determining and documenting measurement uncertainties.