[en] This document describes briefly the VAMP programme (Validation of Environmental Model Predictions). The main objectives of the programme are to provide a mechanism for the validation of assessment models by using the environmental data on radionuclide transfer that have resulted from the Chernobyl release; to acquire data from affected countries for that purpose; and to produce reports on the current status of environmental modelling and te improvements achieved as a result of post-Chernobyl validation efforts. 9 figs