This study aimed to define the term 'profound and multiple learning disabilities' (PMLD). A shared understanding of terminology or diagnostic terms describing groups of individuals is important for the purposes of strategic development, service planning, and the provision and equity of service delivery. A literature review provided different definitions and meanings associated with the term. The meaning attributed to the definitions was explored in focus groups and individual interviews (face to face and telephone) with service managers, commissioners, practitioners, frontline healthcare staff and family carers who provide services, support and care for people with PMLD. Further iterative discussions were held with a smaller group over the precise wording of the chosen definition to ensure there was a shared and common understanding. Personal characteristics for the purpose of this study are defined as diagnoses, disabilities, impairments, activity restrictions and other characteristics which represent a person with PMLD.

Single case experimental design (SCED) has a long, well‐respected tradition in evaluating the effectiveness of behavioural interventions for people with learning disabilities and challenging behaviours. However, shift the focus to other psychological modalities (such as psychodynamic psychotherapy) or differing presenting problems (such as interpersonal problems) and the use of SCED methodologies is severely curtailed. This paper describes the application of SCED methodologies in the evaluation of treatment of three clients: the psychodynamic psychotherapy of hypochondriasis in an A/B design, psychodynamic psychotherapy of ambulophobia in an A/B design, and cognitive‐behavioural therapy of anger and aggression in a shifting criterion design. Visual and statistical analysis of the time series data revealed that the hypochondriasis and the anger cases responded to treatment, whereas the ambulophobia case showed some deterioration during the intervention. The cases are discussed in terms of the strengths and weaknesses of the methodologies applied and the relative merits of accruing SCED evidence in the evaluation of the plethora of psychological modalities now being made available to learning disabled clients.

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Emerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services. Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.

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