Book Reviews: 3 Assessment and intervention : Sign and symbol communication for mentally handicapped people P. R. Jones and A. Cregan Beckenham: Croom Helm,1986. xiii + 147 pp

Kiernan, C.C. , Reid, B.D. and Jones, L.M. 1982: Signs and symbols: a review of literature and survey of use of non vocal communication systems. London: University of London Institute of Education, and Heinemann .