Mentally handicapped Children 5 Mental retardation 3 Physical education 3 Recreational therapy 3 Rehabilitation 3 Behaviour modification 2 Education 2 Language 2 Recreation 2 Behaviour therapy 1 Child behaviour 1 Communicative disorders 1 Dissertations, Academic(Ph.D) 1 Down syndrome 1 Family stress 1 Great Britain 1 History 1 Intellectual disability 1 Language acquisition 1 Mentally Retarded 1 Mentally retarded 1 Methodology 1 Modularity (Psychology) 1 Psycholinguistics 1 Rehabitation 1 Research Report 1 Teaching 1 Thesis(Ph.D)-Behavioural sciences 1