What Are Peer-Mediated Interventions?
Peer-mediated interventions (PMI) are strategies in which peers are systematically trained to implement specific interaction techniques with target individuals who have social, communication, or behavioral skill deficits. The peer serves as the change agent, delivering prompts, models, reinforcement, and social opportunities within natural contexts.
PMI originated from the recognition that adult-delivered social skills instruction often fails to generalize to natural peer interactions. Strain and colleagues (Strain, Shores, and Timm, 1977) were among the first to demonstrate that training peers to initiate social interactions with children who had social withdrawal led to significant increases in social engagement that generalized beyond the training context.
Rationale for Peer-Mediated Approaches
There are several compelling reasons to use PMI in clinical and educational settings:
- Naturalistic context: Peers provide a natural social context that more closely resembles the environments where the individual needs to use social skills.
- Generalization: Skills learned through peer interactions are more likely to generalize to other peer contexts than skills taught exclusively by adults.
- Social validity: Interactions with peers are age-appropriate and socially meaningful, increasing the likelihood that the skills will be maintained by natural reinforcement.
- Efficiency: Training peers allows one adult to facilitate social learning for multiple individuals simultaneously.
- Bidirectional benefits: Research consistently shows that trained peers also benefit from the experience, developing empathy, leadership skills, and a better understanding of individual differences.
Selecting Peer Models
Not all peers are equally suited for PMI. Effective peer models typically demonstrate the following characteristics:
- Consistent school or program attendance
- Age-appropriate social and communication skills
- Willingness to participate and interest in helping
- Ability to follow adult instructions reliably
- History of positive interactions with the target individual or similar individuals
- Tolerance for non-typical social responses
It is generally recommended to select two to three peers per target individual to prevent any single peer from becoming fatigued or overburdened and to promote generalization across interaction partners.
Training Peers
Step 1: Explain the Purpose
In age-appropriate language, explain to the peer that some children need extra help learning to play and talk with friends. Emphasize that the peer's job is to be a good friend and helper. Avoid clinical language or labels.
Step 2: Teach Specific Strategies
Train the peer in specific interaction strategies using behavioral skills training (BST): instruction, modeling, rehearsal, and feedback. Common strategies include:
- Initiate interactions: Teach the peer to approach the target individual, offer toys, suggest play activities, or ask questions.
- Persist through non-responses: Train the peer to repeat initiations or try a different approach if the target individual does not respond initially.
- Respond to the individual's initiations: Teach the peer to recognize and respond positively to any social bids from the target individual.
- Provide natural reinforcement: Show the peer how to praise, share, and reciprocate during interactions.
Step 3: Practice in Role-Play
Have the peer practice the strategies in role-play scenarios with the adult playing the role of the target individual. Provide specific feedback and praise for correct implementation of each strategy.
Step 4: Practice in Natural Settings with Coaching
Move to the actual setting and have the peer implement the strategies with the target individual while the adult provides discreet coaching (whispered prompts, gestures, signals). Gradually fade the coaching as the peer demonstrates competence.
Implementation Models
Peer Initiation Training
The peer is trained to initiate social interactions with the target individual. This model is best suited for individuals who are responsive to social bids but rarely initiate on their own.
Peer Tutoring
The peer serves as a tutor for academic or skill-based tasks. The peer provides prompts, delivers materials, and offers feedback during structured learning activities.
Peer Networking
A small group of peers and the target individual participate in structured social activities facilitated by an adult. The adult guides the group interaction, gradually fading support as the peer network develops natural interaction patterns.
Monitoring and Supporting the Intervention
PMI requires ongoing adult supervision and support. Monitor peer fidelity by periodically observing and scoring the peer's use of trained strategies. Provide booster training sessions when fidelity drops. Collect data on the target individual's social behavior to assess the intervention's effectiveness. Rotate peers periodically to prevent burnout and promote generalization.
Common Mistakes
- Insufficient peer training: Simply placing a peer near the target individual without systematic training is not PMI. Peers need explicit instruction and practice.
- Over-reliance on a single peer: Using only one peer creates dependency and limits generalization. Use multiple peers across settings.
- Failing to monitor peer experience: Check in regularly with peers to ensure they are still willing and comfortable in their role. Forced participation undermines the intervention.
- Not reinforcing the peer: Peers need reinforcement for their efforts. Provide consistent praise, privileges, or other reinforcers to maintain their participation.
BCBA Exam Relevance
PMI may appear on the BCBA exam in questions about generalization strategies, naturalistic teaching approaches, social skills interventions, and the role of the social environment in behavior change. Be prepared to describe the steps for selecting and training peers, identify which PMI model is most appropriate for a given scenario, and discuss the advantages of peer-mediated over exclusively adult-delivered instruction.