Four handicapped children were taught four positive social-emotional behaviors: smiling, sharing, positive physical contacting, and verbal complimenting, using instructions, modelling, and praise. Rates of these behaviors were shown to increase in four trained subjects using a within-subject multiple-baseline experimental design. The generality of the behavior change was investigated by integrating three untrained subjects with the trained subjects in a setting free of adult-imposed contingencies and through a series of follow-up observations. Three trained subjects evidenced collateral increases in the generalization setting on at least one other behavior when training in smiling was conducted. One trained subject showed generalization session increases for each behavior when training was conducted to increase that behavior. All three untrained subjects demonstrated increased rates of smiling and sharing when interventions were conducted to increase those behaviors with the trained subjects. There was no appreciable generalization of verbal complimenting by either the trained or the untrained subjects. Both trained and untrained subjects generally maintained their increased rates of smiling, sharing, and positive physical contacting across four weeks of follow-up observations.

Two peer-imitation training procedures were applied to increase the imitation between retarded and nonretarded children in integrated preschool settings. Baseline observations revealed low rates of imitation and social interaction between retarded and nonretarded classmates under naturalistic conditions. A simple training procedure, consisting of adultdelivered prompts and social reinforcement, was employed to increase the retarded children's imitation of their nonretarded classmates' free-play behavior. Demonstrations of training effects were made utilizing both multi-element baseline and multiple baseline designs. Data collected under nontraining conditions indicated maintenance of peer-imitation effects. Increases in reciprocal social interaction between retarded and nonretarded children were also noted under taining and nontraining conditions.

Recent trends toward early intervention and mainstreaming have resulted in a growing number of preschool programs that integrate retarded and nonretarded children. These programs are generally based on the assumption that nonhandicapped peers function as behavioral models and/or reinforcing agents for handicapped youngsters within the context of positive social interaction. However, a review of relevant empirical literature indicates that such benefits do not necessarily result from integrated programing. This article discusses the implications of recent studies that have investigated procedures for structuring peer imitation and peer reinforcement at the preschool age level. Specific suggestions are offered for maximizing the potential benefits of integrated early childhood programs. Additionally, recommendations are made concerning research needs in this area.

The present investigation demonstrated a systematic teaching procedure for establishing a normal toddler as a peer-model for three children showing delayed development, each one under 27 mo. of age. For each delayed subject, training consisted of adult-directed prompting and social reinforcement contingent upon the delayed children's imitations of material use and motor responses emitted by a normal peer. Within-subjects multiple-baseline designs across responses were used to demonstrate intrasubject control over imitative responding. Indices of stimulus and response generalization were assessed through having the peer-model present the trained responses along with untrained responses in a situation free of adult prompting and social reinforcement for imitative responding. Results indicated that the training in peer-imitation was successful for establishing the peer-model's behavior in a stimulus control relationship with the imitative responding of the delayed children. Moreover, the findings generally demonstrated transfer of training across stimulus situations and responses. Implications for educational programming with developmentally delayed children are discussed.

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