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    <abstract>In psychotherapy, therapeutic outcome assessment, or treatment outcome evaluation, is essential to mental health care by systematically evaluating therapeutic processes and outcomes. Existing large language model approaches often focus on therapist-centered, single-session evaluations, neglecting the client’s subjective experience and longitudinal progress across multiple sessions. To address these limitations, we propose IPAEval, a client-Informed Psychological Assessment-based Evaluation framework, which automates treatment outcome evaluations from the client’s perspective using clinical interviews. It integrates cross-session client-contextual assessment and session-focused client-dynamics assessment for a comprehensive understanding of therapeutic progress. Specifically, IPAEval employs a two-stage prompt scheme that maps client information onto psychometric test items, enabling interpretable and structured psychological assessments. Experiments on our new TheraPhase dataset, comprising 400 paired initial and completion stage client records, demonstrate that IPAEval effectively tracks symptom severity and treatment outcomes over multiple sessions, outperforming baseline approaches across both closed-source and open-source models, and validating the benefits of items-aware reasoning mechanisms.</abstract>
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%0 Conference Proceedings
%T Multi-Session Client-Centered Treatment Outcome Evaluation in Psychotherapy
%A Na, Hongbin
%A Shen, Tao
%A Yu, Shumao
%A Chen, Ling
%Y Piperidis, Stelios
%Y Bel, Núria
%Y van den Heuvel, Henk
%Y Ide, Nancy
%Y Krek, Simon
%Y Toral, Antonio
%S Proceedings of the Fifteenth Language Resources and Evaluation Conference
%D 2026
%8 May
%I ELRA Language Resource Association
%C Palma de Mallorca, Spain
%F na-etal-2026-multi
%X In psychotherapy, therapeutic outcome assessment, or treatment outcome evaluation, is essential to mental health care by systematically evaluating therapeutic processes and outcomes. Existing large language model approaches often focus on therapist-centered, single-session evaluations, neglecting the client’s subjective experience and longitudinal progress across multiple sessions. To address these limitations, we propose IPAEval, a client-Informed Psychological Assessment-based Evaluation framework, which automates treatment outcome evaluations from the client’s perspective using clinical interviews. It integrates cross-session client-contextual assessment and session-focused client-dynamics assessment for a comprehensive understanding of therapeutic progress. Specifically, IPAEval employs a two-stage prompt scheme that maps client information onto psychometric test items, enabling interpretable and structured psychological assessments. Experiments on our new TheraPhase dataset, comprising 400 paired initial and completion stage client records, demonstrate that IPAEval effectively tracks symptom severity and treatment outcomes over multiple sessions, outperforming baseline approaches across both closed-source and open-source models, and validating the benefits of items-aware reasoning mechanisms.
%R 10.63317/3am66kas7b32
%U https://aclanthology.org/2026.lrec-1.231/
%U https://doi.org/10.63317/3am66kas7b32
%P 2952-2968

Markdown (Informal)

[Multi-Session Client-Centered Treatment Outcome Evaluation in Psychotherapy](https://aclanthology.org/2026.lrec-1.231/) (Na et al., LREC 2026)

• Multi-Session Client-Centered Treatment Outcome Evaluation in Psychotherapy (Na et al., LREC 2026)

ACL

• Hongbin Na, Tao Shen, Shumao Yu, and Ling Chen. 2026. Multi-Session Client-Centered Treatment Outcome Evaluation in Psychotherapy. In Proceedings of the Fifteenth Language Resources and Evaluation Conference, pages 2952–2968, Palma de Mallorca, Spain. ELRA Language Resource Association.