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Purpose: This paper aims to outline the initial pilot use of the client complexity matrix (CCM), an outcome measure developed for an NHS Adult Intellectual Disabilities Intensive Support Team (IST) in the West Midlands of England. Design/methodology/approach: A mixed method approach was used to report the results and evaluate the use of the CCM within this IST. The CCM was trialled for six months between January 2022 and June 2022. CCM scores pre and post IST intervention were analysed via t-test, and qualitative feedback from clinicians is detailed. Findings: Analysis suggests the CCM captures service success showing a significant decrease in complexity and risk post-intervention. Qualitative comments from clinicians were generally positive; however, there were requested changes regarding specific presentations, use of labels/language and for a digital version. Research limitations/implications: The tool is not co-constructed with the client. Because of this IST's caseload, the sample size was small. Only one clinician was asked to complete the CCM pre and post intervention. Future use of the measure will encourage two clinicians to complete the measure to evidence its inter-rater reliability. Each client's specific presentation was not explicitly analysed here. Practical implications: The CCM will be updated using the feedback from clinicians and from the peer review process. Research that examines the generalisability of this measure to other IST services would be beneficial. Originality/value: The CCM appears to fill a gap in outcome measurements for this IST service which looks at breadth and depth of client complexity and risk. [ABSTRACT FROM AUTHOR]

Purpose: Fidelity data in clinical trials are not only necessary for appraising the internal and external validity, but also could provide useful insights how to improve the application of an intervention in everyday settings. The purpose of this paper is to understand the current literature of fidelity measurements in complex interventions for people with intellectual disabilities (ID) and behaviours that challenge. Design/methodology/approach: The electronic databases MEDLINE, Embase, PsycINFO, Web of Science and CINAHL Plus were searched for studies published between 1990 to 2017 that have mentioned fidelity in randomised controlled trials of complex interventions for people with ID and behaviours that challenge based on positive behaviour support or applied behaviour analysis principles. The authors also searched the grey literature and reference lists. Findings: Five randomised controlled trials were included in the review. The authors found variable and inconsistent fidelity measurements reported in the studies. The most frequently provided fidelity elements found in four out of five studies were adherence of implementation, dose and some aspects of quality of delivery. Research limitations/implications: Research recommendations for a standardised approach of measuring fidelity in such studies are suggested. Originality/value: The first review of such type that confirms the paucity of research measuring fidelity in complex interventions in this population. [ABSTRACT FROM AUTHOR]