11 laboratories took part in a proficiency test regarding two Ni-base alloys. The analytical techniques used were GFAAS (Graphite Furnace Atomic Absorption Spectroscopy), AAS (Atomic Absorption Spectroscopy), ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometry), Spark-OES (Spark- Optical Emission Spectrometry), ICP-MS (Inductively Coupled Plasma-Mass Spectrometry), XRF (X-Ray Fluorescence), GD-MS (Glow Discharge-Mass Spectrometry) and combustion techniques for the elements N, 0 and S. A statistical evaluation was carried out in order to find outlying values by applying the Cochran' s test and the Grub b' s test.