Experience with the GUM Workbench software at the University of Tartu is described. Although primarily meant for measurement uncertainty estimation, the scope of use of GUM Workbench is significantly broader: it allows one to analyse one's measurement procedure and to find out how to improve it. The most important features of the software in addition to providing the measurement uncertainty for a specific measurement procedure are the possibilities of finding out what are the main contributors to the measurement uncertainty and presenting the whole measurement procedure—description, equations, data and comments—in a very clear and accessible way. The usefulness of these features in teaching is specifically stressed.