The collaborative programme was initiated at IRG Meetings in Wildhaus, 1976. The six collaborators were BAM (Berlin), Cuprinol Ltd (UK), EMPA (Switzerland), GORI (Denmark), PRL (UK) and Imperial College (UK). Experimental plans were finalised in December 1976 and panels treated by Cuprinol Ltd early in 1977. Natural weathering was carried out by BAM, Cuprinol, EMPA, GORI and PRL during April-September 1977. The biological test was carried out by the authors at PRL during May and June 1978 and final assessments were made in September 1978. Artificial weathering systems used were the BAM Weathering System, a modified Marr system (Cuprinol), the Xenotest (EMPA), the Atlas equipment (GORI), the Marr equipment (PRL). In the main, natural weathering during 1977 was equivalent to the artificial weathering systems run for 500 hours and slightly more severe than the same systems run for 250 hours. It is suggested that the most technically appropriate artificial weathering systems are the Atlas (500 hrs) and the Marr (250 hours).

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