Evaluation parameters for evidence-based practices for people with autism spectrum disorder: a narrative review of group and single-subject design studies.

Recommendations for using evidence-based practices have become increasingly common in services for individuals diagnosed with autistic spectrum disorder (ASD). The aim of this study was to conduct a narrative literature review to identify differences and similarities in evidence-evaluation criteria for group and single-subject designs that empirically support interventions for people with ASD. Data sources used in this analysis were reports and articles elaborated by different clearinghouses (i.e., National Autism Center, National Professional Development Center, and the National Clearinghouse on Autism Evidence and Practice). The criteria for evaluating evidence, as defined by these documents, contained specific components or quality indicators for each type of study design. The different criteria for evaluating evidence and for classifying the interventions (once evidence was evaluated) were identified and described. This manuscript discusses the need for (a) expanding the analysis beyond the evidence identified by different researchers and organizations such as the clearinghouses, (b) proposing interventions that are based not only on scientific evidence but also on social validity - which is directed by client idiosyncrasies, and (c) attention to the fact that EBPs should not be seen as static information regarding interventions with empirical support: evidence-based practices are the result of constant analysis of the intervention implementation data added to professional training and client values and context. Some additional issues and the study limitations are also presented.