The national treatment obligation in the General Agreement on Trade in Services (GATS) is wider in scope but more limited in application than that in the General Agreement on Tariffs and Trade (GATT). It is wider in scope because, while national treatment under GATT is concerned with measures affecting products per se, the domain of this obligation in the GATS includes not only measures affecting services products, but also measures affecting service suppliers. It is more limited in application because, while national treatment under the GATT applies across the board, under the GATS it applies only to scheduled sectors, and there too may be subject to limitations. These differences were intended and are well known. An elaboration of the concept of National Treatment would help us gain a better understanding of the reasons behind this approach.