Previous research has shown that responding to the appropriate and problematic speech of individuals diagnosed with developmental disabilities with interested and uninterested listener responses, respectively, can promote more appropriate conversational engagement. However, Fisher et al. (2013) also responded to appropriate speech with access to preferred conversational topics. This study examined the influence of listener interest on the problematic speech of 8 participants and tested the additive effects of (Study 1) and participant preference for (Study 2) delivering preferred topics as reinforcement for appropriate speech. Interventions were equally effective with or without arranging access to preferred topics, but a majority of participants demonstrated a preference for intervention with contingent access to preferred topics. Caregivers and speech-language pathologists rated the intervention procedures as acceptable and changes in participants' speech satisfactory.