General approach to the evaluation of measurement uncertainties

Since 1995 with the first edition of the GUM by Joint Committee Guide for Metrology, (JCGM) expression of uncertainty in measurement takes a large part in measurement activities. To be able to give a measurement result with a sound uncertainty expectation, different approaches exist that were covered in several linked documents depending of the available measurement model. In this presentation, we will give an overview of the main methods based on physical model and show that each available method addresses a corresponding model situation.