At the 5th meeting of IRG in Lahti (June 1973) it was decided that an ad hoc group should be formed to study these problems. It was decided that it's activity could be usefully directed in two main areas; a) in the encouragement and direction of existing research in this field, and b) in the organising of a collaborative field trial involving interested parties using locally important hardwood species and existing preservatives. A third area of work is suggested, namely the compilation of existing hardwood field trial results (with hardwood species other than beech) and the bringing together of service experience with treated hardwoods in ground contact.

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