Renewal is defined as the reemergence of a previously eliminated behavior following a context change. Determining the prevalence of this effect in clinical practice would allow clinicians to better anticipate the reemergence of problem behavior, such as when a patient is discharged from a treatment facility to return to their home. The current consecutive, case‐series analysis determined the prevalence and magnitude of renewal when implementing behavioral treatments for problem behavior. Across 182 context changes, renewal was observed 77 times (42.3%). In the first session following the context change, problem behavior rates increased by a factor of 3 and then decreased across successive sessions. These results indicated that renewal effects may be common, but are also transient and return to rates observed before context changes.

The current study examined resurgence of problem behavior during thinning of multiple schedules of reinforcement following functional communication training replicating previous research (Briggs et al., 2018). Data were analyzed at each thinning step from subjects enrolled in an intensive day treatment program over a 5-year period. Results indicated that of the 239 thinning steps analyzed, resurgence was observed in 97 of those steps (40.6%), similar to results of Briggs et al. (2018). The data were also analyzed to estimate the magnitude of resurgence when it was observed. In the first session after the thinning step, the rate of problem behavior observed was 7 times higher than the average of the 5 sessions pre-thinning step.