This Technical Report is a guideline to carry out the statistical evaluation of data from an inter laboratory test for method validation. Its purpose is to detail the methodology of ISO 5725-1:1994, ISO 5725-2:1994 and ISO 5725-3:1994 for the treatment of the data collected under the conditions used within the ECISS/TC 102 working groups. NOTE The present document is not a simplification of the ISO 5725 standard, which is the only reference document.