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In the design of Free Electron Lasers, parameters like the peak power and the spectral power were established as figures of merit to evaluate the FEL output quality. However, spectra obtained with FEL studies using bunches from start-to-end simulations do not have a purely Gaussian profile, so that these simple parameters can no longer be used as figures of merit. Furthermore, criteria such as the signal-to-noise ratio and the stability of the source point, which is of extreme importance for the transport of the radiation to the user experiment, should be included in the design considerations. This paper suggests different criteria and parameters to describe and compare the FEL output, which are not readily provided by the common FEL codes. An IDL code has been written, that extracts this information from the regular GENESIS output. This procedure will be used to analyze the output of the BESSY FEL.
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