The QMSys GUM program is used to analyze the uncertainty of physical measurements and calibrations. The analysis and computations follow the rules of the of the official documentations: - ISO Guide to the expression of uncertainty in measurement - Supplement 1 to the Guide to the expression of uncertainty in measurement - EA-4/02 Expression of the Uncertainty of Measurement in Calibration - DKD-3 Angabe der Messunsicherheit bei Kalibrierungen - EURACHEM/CITAC Guide, Quantifying Uncertainty in Analytical Measurement - ANSI/NCSL Z540.2 - U.S. Guide to the Expression of Uncertainty in Measurement. - NPL Report DEM-ES-010 Software specifications for uncertainty evaluation. For this reason the software is compliant with the demands of the standards: - ISO/IEC/EN 17025:2005 concerning the evaluation of the measurement uncertainty - ISO/EC/DIN 15189:2007 concerning the evaluation of the measurement uncertainty in the medical-analytical sector - ANSI/NCSL Z540.3-2006 - Requirements for the Calibration of Measuring and Test Equipment. The QMSys GUM program uses two different methods to calculate the measurement uncertainty: - uncertainty propagation, which has been described extensively in the GUM framework. - Monte-Carlo method, which has been detailed in the first GUM-supplement. The most important features offer: - Suitably for linear and not linear models - Support of symmetrical and asymmetrical distributions of the output quantities - Unlimited number of input and output quantities - Distributions: Normal, Lognormal, Student`s t, Rectangular, Triangular, Trapezoidal, curvilinear Trapezoidal, U-shaped, Quadratic, Exponential, Cosine, 1/2 Cosine - Direct and indirect methods of observation - Monte-Carlo trials up to 1 000 000 - Statistical evaluation - Validation with Monte Carlo Uncertainty Workshop is the most cost-effective measurement uncertainty analysis tool for achieving compliance with ISO 17025 and ANSI/NCSL Z540.3.