During summer and fall 1998, 75 sample takers and 20 employees of laboratories of 26 institutes measuring emissions in Germany and Switzerland estimate the uncertainty of measuring results of 5 selected VDI-standard emission measuring methods. The applied method of systematic comparative estimation showed that the estimated total uncertainties UT of the investigated measuring methods range between 12% and 21%. The results of the round robin estimation for one of the methods (dust measuring 2066 Part 7) with UT = 15.4% are equal to those of the system for simulation of emissions (HLfU Kassel) with 15.5%. This confirms the expectation of the initiators of the project that the systematic comparative estimation is useful for the characterization of test methods and hence for the validation of methods.