ORR, ELEANOR WILSON.Twice As Less: Black English As The Performance Of Black Students In Mathematics And Science. W. W. Norton, New York: 1987. 0393023923 / 9780393023923 First Edition. h Hardcover with dustjacket. Good condtion. Argues that the performance of black students in math and science is crippled not by lack of intelligence or diligence bu by linguistic interference. Using student work from an experiental program she helped establish in the District of Columbia, the author traces specific ways nonstandard English usage can lead not merely to non-understanding but to actual misunderstanding. Includes an Index.