Supplemental Material for Strengthening the Efficacy of Adlerian Play Therapy Through the Measurement Model

To promote the credibility of play therapy and encourage the trend of practitioners utilizing evidence-based practices (EBPs), researchers are called to continue providing evidence and establishing fidelity within the leading approaches in the field. Past studies have identified Adlerian Play Therapy (AdPT) as one of the most widely used approaches (Lambert et al., 2007) as well as an EBP (Substance Abuse and Mental Health Services Administration [SAMSHA], 2016). Through the use of qualitative video content analysis of 27 individual play therapy sessions, researchers created the instrument, the Adlerian Play Therapy Measurement Model (AdPTMM), to establish and evaluate fidelity of treatment.