“…In a study of conservation of continuous quantity and number among Yoruba and Oje children in Nigeria, Lloyd (1971) reported that Oje girls' performance was significantly inferior to that of Oje boys, irrespective of the familiarity of the test material. Rogan and Macdonald (1983), working with Xhosa children of Ciskei, South Africa, attempted to address the question of whether differences in teaching patterns and learning experiences could affect specific conservation skills. Using the Science Education Project (SEP), the selection was taken from nine classrooms in six 'project schools and nine classrooms in five control schools.…”