IQ-test is a Thematic Network supported by the European Community under the EESD Programme. The objective of IQ-test is to further the development of common quality procedures at the PASLINK test cell facilities in 12 European countries, for the assessment of the thermal characteristics of building components. This should consolidate the network, integrate the newer test sites and strengthen its common approach of support for new product developments in the field of innovative building components. Round robin tests are under-way to assess both the inter-site quality of testing and analytical procedures of the participants. Two components were designed: (1) an opaque, well insulated, homogeneous panel and (2) a window, which is used to replace the central section of the first component. Common test and quality procedures have been implemented at each test site. The data sets generated by each team have been made available for cross-analysis by another team. The results available so far on the first component indicate good agreement between sites. This paper summarises the progress to date. Results are also presented from a training exercise which asked participants to identify the performance characteristics of an unknown component without providing any physical description of the component. (C) 2004 Published by Elsevier B.V.