2026-10-13T13:43:33Z https://api.figshare.com/v2/oai

oai:figshare.com:article/32638803 2026-10-01T16:45:13Z portal_1172 item_type_8 month_year_10_2026

An evaluation of acceptance and commitment therapy fidelity measures Daniel Collins (145022) PUREID: 529255442 acceptance fidelity commitment therapy Fidelity assessment is essential in the design of clinical trials, helping ensure that treatment is delivered as intended. It helps grow confidence that findings from a clinical trial are related to the treatment. The ACT literature has repeatedly been critiqued for the lack of fidelity assessment in ACT trials, suggesting there is uncertainty that ACT was delivered as intended and less confidence that treatment effects are related to the ACT intervention. Measures used also often lack validity and reliability evidence. An extended literature review was carried out to critically evaluate the existing ACT fidelity measures to consider design issues impacting their uptake, as well as available psychometric evidence that ensure measures are both valid and reliable. The ACT-FM appeared to be a promising measure addressing design issues of its predecessors.<br><br> A study then assessed the ACT-FM’s discriminant validity in evaluating different levels of ACT fidelity and its inter-rater reliability. In total, 14 participants were recruited who had experience in ACT. These individuals were asked to rate three audio clips of simulated therapy displaying various levels of ACT fidelity using the ACT-FM. Repeated measures ANOVAs indicated that ACT-FM scores differed significantly between simulated therapy sessions in the hypothesised ways. These results illustrated an ability of the measure to discriminate between differing therapist fidelity to ACT. Intraclass correlations indicated that moderate levels of agreement were obtained between 14 clinicians on ACT consistent and inconsistent total scores on the ACT-FM. However, confidence intervals indicated that there was a great degree of variability in the sample. Exploratory analyses at the subscale level, showed in general that subscale scores could discriminate between different levels of ACT fidelity and adequate levels of agreement between clinicians was found. Findings from the present study provides support for the use of the use of ACT-FM in clinical trials.<i><br></i> 2026-10-01T16:45:13Z Text Thesis 10.17034/32638803.v1 https://figshare.com/articles/thesis/An_evaluation_of_acceptance_and_commitment_therapy_fidelity_measures/32638803 All Rights Reserved