[en] Research of the Office of the Supervising Scientist (OSS) is now tending to concentrate more on the problems that will arise with the decommissioning and rehabilitation of the mine sites, and in providing the knowledge that will enable the very stringent rehabilitation goal and objectives for the Ranger mine site that have been established by the Commonwealth and Northern Territory Governments, to be achieved. Since rehabilitation must be designed to achieve objectives, the success of which will not be known for many decades in the case of revegetation, and many hundreds of years in the case of tailings containment, the science underlying the engineering designs must be sufficiently secure to give confidence that those objectives will be achieved. The current OSS research program, presented in the Annual Report modified as necessary as developments unfold, provides a sound scientific base. Whilst the precise nature of the future development of the Ranger site is not known, the Supervising Scientist is confident, given the continued existence of the OSS with its research base in the Alligator Rivers Research Institute, that the knowledge will be available to ensure that the No. 3 ore body and the Jabiluka resource can be developed without damage to the ecosystems of Kakadu National Park. 16 tabs., 22 figs