The directive, 75/442/EEC, containing this definition was amended in 1991 (91/156) with the addition of "categories of waste" (Annex I) and the omission of any reference to national law.
而同樣含有上述定義的指令75/442/EEC則在1991(91/156)調整為加上「一種廢棄物的分類」(Annex I)。