Following baseline (i.e., no intervention/business as usual) sessions, children will receive the intervention, consisting of a function-based intervention. This intervention will be implemented by the caregiver. The intervention will consist of teaching the child an alternative, appropriate skill (usually communication) to replace the problem behavior. The caregiver will provide reinforcement for the appropriate skill and no reinforcement (i.e., extinction) following problem behavior. The caregiver will also learn and use general strategies for teaching social-emotional skills (e.g., setting appropriate rules) as part of the intervention.

This intervention will be implemented by the caregiver. The intervention will consist of teaching the child an alternative, appropriate skill (usually communication) to replace the problem behavior. The caregiver will provide reinforcement for the appropriate skill and no reinforcement (i.e., extinction) following problem behavior. The caregiver will also learn and use general strategies for teaching social-emotional skills (e.g., setting appropriate rules) as part of the intervention.

The investigators will conduct 5-min observations and record the frequency of the child's problem behavior (e.g., aggression, self-injury, screaming) during each session. The specific problem behavior(s) recorded will be defined individually by participant.

The investigators will conduct 5-min observations and record the frequency of the child's appropriate behavior (e.g., communication) during each session. The specific appropriate behavior(s) recorded will be defined individually by child participant.