“…Inherited disciplinary boundaries and some of the traditional subject matter are hard to justify, especially in comparison with other related sciences, with the demands of society and the needs of the pupils. As a result, new material for teaching has been consistently developed and tested, and old subject matter is being adapted in the course of curriculum development (L'Héritier and Rizet, 1960;Schwab, 1964;Dyer, 1967;Kelly, 1967;Gohau, 1971).…”