This paper identifies the need for a shared definition of intellectual disability for health and social services.
Intellectual disability is generally described in broad terms, i.e. a disability which started before adulthood; reduced ability to cope independently due to a reduced ability to understand new information and learn new skills.
The first part of this paper reviews a range of definitions; each has advantages but also serious disadvantages. As a result, this paper concludes with a proposal for a composite definition. It is suggested that this presents a very practical way of defining the eligible population of those needing specialist services. This would enable resources to be focused on those most in need, but without neglecting those who would fall outside the scope of a more simplistic definition.
Underpinning this discussion is the acknowledgement that learning disability services provide the support that people require by virtue of their learning (and associated) disabilities, and are not a substitute for the general services available to the rest of the population.
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References
1.
American Association on Mental Retardation1992Mental Retardation: Definition, Classification and Systems of Support. AAMR, Washington DC
2.
Blum J.M.1978Pseudoscience and Mental Ability. The Origins and Fallacies of the IQ Controversy. Monthly Review Press, New York and London
3.
British Psychological Society1991Mental Impairment and Severe Mental Impairment A Search for Definitions. British Psychological Society, Leicester
4.
Brown A.L., French L.A.1985The zone of potential development: implications for intelligence testing in the year 2000Intelligence3255-277
5.
Burton M., Kagan C.1995Social Skills for People with Learning Disabilities A Social Capability Approach. Chapman and Hall, London
6.
Crawford J.R., Gray C.D., Allan K.M.1995The WAIS-R (UK): Basic psychometric properties in an adult UK sample. British Journal of Clinical Psychology34:237-250
7.
Cronbach L.J., Gleser G.C., Nanda H., Rajaratnam N.1972The Dependability of Behavioral Measurements Theory of generalizability for scores and profiles. Wiley, New York
8.
Doll E.A.1953The Measurement of Social Competence. Educational Test Bureau, Washington
9.
Dunn L.M., Dunn L.M.1981Peabody Picture Vocabulary Test- Revised. American Guidance Service, Circle Pines, Minnesota
Fryers T.1984The Epidemiology of Severe Intellectual Impairment: The Dynamics of Prevalence. Academic Press, London
12.
Gathercole C.E.1968Assessment in Clinical Psychology. Penguin, Harmondsworth
13.
Greenspan S., Granfield J.M.1992Reconsidering the construct of mental retardation implications of a model of social competence. American Journal on Mental Retardation96: 442-453
14.
Gunzburg H.C.1968Social Competence and Mental Handicap: An Introduction to Social Education. Ballière Tindall, London
15.
Kaufman A.S.1985Review of Wechsler Adult Intelligence Scale - Revised. In: Mitchell J V, ed. The Ninth Mental Measurements Yearbook. University of Nebraska Press , Lincoln, Nebraska: pp1699-1703
16.
Ley P.1972Quantitative Aspects of Psychological Assessment. Duckworth, London
17.
Lumsden J.1976Test theory. Annual Review of Psychology27: 251-280
18.
Lumsden J.1978Tests are perfectly reliableBritish Journal of Mathematical and Statistical Psychology31: 19-26
Martindale A.1983Children 'at risk' of using mental handicap services who do not attend ESN(S) schools - a four-year follow up, 1978-1982. Report No. 13, SheffieldCase Register Sheffield Health Authority
21.
Matarazzo J.D.1985Review of Wechsler Adult Intelligence Scale - Revised In Mitchell J V, ed. The Ninth Mental Measurements Yearbook. University of Nebraska Press, Lincoln, Nebraska, pp1703-1705
22.
Nihara K., Leland H., Lambert N.1975AAMR Adaptive Behavior Scales. American Association on Mental Retardation, Washington
23.
North Western Regional Advisory Group for Learning Disability Services1990 In: Burton M , ed Caught in the Competence Trap: A Report on Service Provision for Adults with Moderate Learning Difficulties. North Western Regional Health Authority, Manchester
24.
Poulton E.C.1976Unwanted range effects from using within-subject designs . Psychological Bulletin80, 113-121
25.
Rasch G.1960Probabilistic Models for Some Intelligence and Educational Tests. Danish Institute of Educational Research, Copenhagen
Schaie K.W., Strother C.R.1968A cross-sequential study of age changes in cognitive behaviour . Psychological Bulletin70671-680
28.
Schopler E., Reichler R.J., Bashford A., Lansing M.D., Marcus L.M.1990Individualised Assessment and Treatment for Autistic and Developmentally Disabled Children Volume 1 Psycho-educational profile revised edition (PEP-R). Pro-Ed, Austm, Texas
29.
Shavelson R.J., Webb M.1991Generalizability Theory: A primer. Sage. Newbury Park, California
30.
Sparrow S., Balla D., Cichetti D.1985Vineland Adaptive Behaviour Scales. American Guidance Servics, Circle Pines, Minnesota
31.
Wechsler D.1981Wechsler Adult Intelligence Scale- Revised. The Psychological Corporation, New York
32.
Weiss D.J., Davison M.L.1981Test theory and methods. Annual Review of Psychology32: 629-658
33.
Witt J.C., Gresham F.M.1985Review of Wechsler Intelligence Scale for Children - Revised . In: Mitchell J V, ed The Ninth Mental Measurements Yearbook. University of Nebraska Press, Lincoln, Nebraska, pp1716-1719
34.
Wooton B.1959Social Science and Social Pathology: Chapter VII, Social Pathology and the Concepts of Mental Health and Mental Illness. George Allen and Unwin, London
