Shah, Sair Ali2022-01-182022-01-181968870https://hdl.handle.net/2139/52970Seventeen teachers of the "Lower" Juniors and 16 teachers of the "Upper" Juniors attending a teachers' college in Trinidad, tried a series of lessons on "sets" with their practising class, during three weeks of their teaching practice session. The reactions of a sample of children were obtained through an objective test, which was standardized with the sample. The responses obtained indicated that attainment was satisfactoryMathematical concepts