Table II

Overview and timing of the intercalibration-intercomparison activity carried out within the ICP-Forests since it was launched in 1985 up to 2007. In brackets: informal exercises. The symbol + identified exercises carried out within ICP-Forests; the symbol § indicates the exercises to which ICP Forests labs took part, but that were organized within different projects (AQUACON–MedBas Subproject No. 6 and “Acid rainε and Subproject No. 7 “Freshwaterε); the symbol * indicates the depositon sampling intercomparison exercise, actually carried out between October 1999 and April 2000 (Draijers et al.,).