Study of individual treatment mechanisms in youth interventions facilitates evidence-based development, selection and implementation of treatment components that are most effective for each individual child. This position paper aims to bring together two important topics from the area of youth intervention research: mediators of treatment outcomes and single-case experimental design methodology. We start by outlining the benefits of studying within-person mechanisms and propose how statistical mediation analysis and single-case methods can be integrated to enable this type of research. Further, we review existing methodology for the study of individual youth treatment mechanisms and provide recommendations for the clinical practice research.

对青少年干预措施中个体治疗机制的研究有助于基于证据的发展、选择和实施对每个儿童最有效的治疗成分。本立场文件旨在汇集青年干预研究领域的两个重要主题：治疗结果的中介因素和单例实验设计方法。我们首先概述研究人体内机制的好处，并提出如何整合统计中介分析和单案例方法来实现此类研究。此外，我们回顾了个体青少年治疗机制研究的现有方法，并为临床实践研究提供建议。