English Abstract The joint research project "Environmental implications
of useful applications of primary and secondary materials to be used on or
in the ground" was carried out by four institutes i.e. RIVM, ECN, TNO and
Intron. The project, coordinated by the RIVM, started in 1985 and finished
in 1990. The objectives of the project were: - to obtain systematic
information of the leaching behaviour of a number of (waste)materials and
products made from these materials. - to create a data-base filled with the
above mentioned information. - to deliver a contribution to the
environmental normalization for the use of (waste)materials and products,
made from these materials. This report describes the controling aspects
concerning the cooperation between the four institutes. The possibility of
exchange of knowledge has played a vital role in the success of this
project.