“…For example, an individual with challenging behavior that is maintained by access to both attention and tangibles may continue to engage in challenging behavior (i.e., low treatment efficacy) if they are taught a communicative response for attention in the absence of tangible items. Another basis for selecting this variable was the potential influence of previously taught mands on treatment efficacy for newly taught mands (e.g., Banerjee et al, 2022; Bloom & Lambert, 2015; Lambert, Bloom, et al, 2017; Lambert et al, 2015, 2020; although see Fuhrman et al, 2021), which was specific to individuals with multiply controlled challenging behavior in our sample. That is, acquisition of multiple communication responses, separately across reinforcer classes, may result in higher efficacy in subsequent training applications via a process of generalization; alternatively, acquisition of multiple communication responses across reinforcer classes may result in relatively more errors (e.g., emission of previously taught responses that contact extinction) that may temporarily increase rates of challenging behavior.…”