The scope of the Convention is confined to hazardous wastes, though not wastes from ship discharges covered by another Convention. Hazardous substances banned, cancelled or refused registration by government regulatory action for health or environmental reasons, are defined as hazardous wastes under the Convention. Radioactive wastes are covered also by the Convention (art. 2). Parties agree to enact legislation identifying and categorising hazardous wastes not already listed in the Convention (art. 3). Parties are to enforce a ban on hazardous waste import, and on the dumping of hazardous wastes at sea and internal waters and in respect of waste generation, they are to adopt precautionary measures (art. 4).