Background Acceptance and Commitment Therapy interventions are increasing in use in neurological populations. There is a lack of information on the measures available. Purpose To identify and classify the measures used in Acceptance and Commitment Therapy research studies with adults with acquired neurological conditions. Methods PRISMA-ScR guided scoping review. MEDLINE, PsycInfo and CINAHL databases searched (up to date 29/06/2022) with forward and backward searching. All study types included. Extraction of Acceptance and Commitment Therapy process-of-change and health-related outcome measures. Outcomes coded using the Core Outcome Measures in Effectiveness Trials (COMET) taxonomy. Results Three hundred and thirty three papers found on searching. Fifty four studies included and 136 measurement tools extracted. Conditions included multiple sclerosis, traumatic brain injury and stroke. Thirty-eight studies measured processes of change, with 32 measures extracted. The process measure most often used was the Acceptance and Action Questionnaire ( n = 21 studies). One hundred and four health-related outcome measures extracted. Measures exploring quality of life, health status, anxiety and depression occurred most frequently, and were used in all included neurological conditions. COMET domains most frequently coded were emotional functioning/well-being ( n = 50), physical functioning ( n = 32), role functioning ( n = 22) and psychiatric ( n = 22). Conclusions This study provides a resource to support future identification of candidate measures. This could aid development of a Core Outcome Set to support both research and clinical practice. Further research to identify the most appropriate and relevant targets and tools for use in these populations should include expert consensus, patient, carer and public involvement and psychometric examination of measures.

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Background: Acceptance and Commitment Therapy (ACT) interventions may promote wellbeing in neurological populations, but there is a lack of evidence to inform measure selection in research. Purpose: To identify and classify the measures used in ACT with adults with acquired neurological conditions.Methods: PRISMA guided systematic review. MEDLINE, PsycInfo and CINAHL databases searched (27/05/2020) with forward and backward searching. All study types included. Extraction of ACT process-of-change and health-related outcome measures. Outcomes coded using the Core Outcome Measures in Effectiveness Trials (COMET) taxonomy.Results: 204 papers screened. 34 studies included. Conditions included multiple sclerosis (n=17), traumatic brain injury (n=9) and stroke (n=8). 25 process-of-change measures extracted. Psychological flexibility was the most common process measured (AAQ-II most commonly used, n=14 studies). 76 health-related outcome measures extracted. Measures exploring quality of life, health status, anxiety and depression occurred most frequently. The Hospital Anxiety and Depression Scale was the most commonly used measure (n=8 studies). Conclusions: Future studies should follow reporting guidelines and consider the consistent use of measures to support synthesis of results. This could be achieved through the development of a Core Outcome Set – a standardised set of measures to be used across trials of ACT with adults with neurological conditions.