The EURL guidance document on the quality control during routine analysis (ongoing performance verification) is now available as version 1.2. Taking into account the feedback received from the NRLs, a section on the selection of representative analytes on which to monitor the method performance has been introduced. The EURLs hope that this information will be helpful to the laboratories active in the field of the analysis of residues of veterinary medicinal products. The provision of constructive feedback for example during the EURL workshops or by e-mail is encouraged and helps to improve the practicality of the guidance documents.