Single-subject research plays an important role in the development of evidence-based practice in special education. The defining features of single-subject research are presented, the contributions of single-subject research for special education are reviewed, and a specific proposal is offered for using single-subject research to document evidence-based practice. This article allows readers to determine if a specific study is a credible example of single-subject research and if a specific practice or procedure has been validated as “evidence-based” via single-subject research.

Earlier autism diagnosis, the importance of early intervention, and development of specific interventions for young children have contributed to the emergence of similar, empirically supported, autism interventions that represent the merging of applied behavioral and developmental sciences. “Naturalistic Developmental Behavioral Interventions (NDBI)” are implemented in natural settings, involve shared control between child and therapist, utilize natural contingencies, and use a variety of behavioral strategies to teach developmentally appropriate and prerequisite skills. We describe the development of NDBIs, their theoretical bases, empirical support, requisite characteristics, common features, and suggest future research needs. We wish to bring parsimony to a field that includes interventions with different names but common features thus improving understanding and choice-making among families, service providers and referring agencies.

In an effort to move incidental teaching research to practical applications for toddlers with autism, a comprehensive early intervention model was developed for use in the natural environments of a childcare center and children's homes. Based on the premise that social readiness will best be achieved by providing early sociallearning opportunities, the center based component of the model targets the developmental needs of an inclusive group of children with and without autism. The home based component involves parents of children with autism as key participants in their children's learning and prepares them to be effective advocates in their children's futures. The curriculum addresses what it is that toddlers need to learn, what environmental arrangements provide the most powerful teaching opportunities, and how teachers and parents can most effectively teach childrento progress at their optimum pace. Outcome data are p resented that documents an impact on the language and social behavior of participating toddlers with autism. Two of the more controversial Walden curriculum components are discussed. Current impediments to system change are considered in the hope that appropriate and effective early intervention may become available to all children with autism.

In a comparison of incidental teaching and traditional training procedures, three language-delayed autistic children were taught expressive use of prepositions to describe the location of preferred edibles and toys. Traditional highly structured training and incidental teaching procedures were used in a classroom setting, and generalization was assessed during free-play sessions. Results dearly indicate that incidental teaching promoted greater generalization and more spontaneous use of prepositions. These findings have important implications for language programming and teacher training, suggesting that incidental teaching should be induded as a standard component of language development curricula for autistic and other developmentally delayed children.

There is a need for practical methods of reinforcer assessment that systematically track ongoing changes in clients' preferences. In this study, the effects of a time-efficient reinforcer assessment package were evaluated in a multiple baseline across 3 preschoolers with autism, comparing individualized item selections by experienced teachers with children's presession preferences for items of various sensory qualities. Systematic assessment of children's reinforcers for correct responding virtually eliminated nontargeted maladaptive behaviors, as well as yielding expected improvements in accuracy. The powerful side-effects of potent reinforcers underline the importance of increased attention to reinforcer assessment in research and practice.