14 peer dyads were observed longitudinally at 16, 20, 24, 28, and 32 months to assess developmental changes in social coordinations (both action-to-action thematic relations and extended games). Each child's movements through the playroom, actions upon play material, vocalizations, verbalizations, and gestures were coded for their relation to the concurrent or immediately prior behavior of the peer: Unrelated, Tangential, Coordinated, Interfering. There was a marked increase with age in acts coordinated with those of a peer, and imitations of the peer's nonverbal actions accounted for most of the developmental change. The use of words to direct the peer in a coordinated way increased with age but remained infrequent. Developmental change in the frequency of games paralleled that for imitative acts, and imitative acts both established and set the theme for most of the games. Thus, imitating another's nonverbal actions is a core behavioral strategy for achieving social coordinations during the developmental period preceding reliance on verbal communication in peer interaction.

The study reported here was designed to examine linkages between mother-child conversational interactions during events and children's subsequent recall of these activities. In this longitudinal investigation, 21 mother-child dyads were observed while they engaged in specially constructed activities when the children were 30, 36, and 42 months of age. Analyses of the children's 1-day and 3-week recall of these events indicated that at all age points, features of the activities that were jointly handled and jointly discussed by the mother and child were better remembered than were features that were either (1) jointly handled and talked about only by the mother, or (2) jointly handled and not discussed. Potential linkages were also explored between incidental memory for personal experiences and deliberate recall of familiar but arbitrary materials. In this regard, children's recall of the special activities was positively correlated with their recall of objects in a deliberate memory task performed at 42 months.

Fourteen dyads of unfamiliar peers (White, both same gender and mixed gender) were observed longitudinally at 16, 20, 24, 28, and 32 months of age. Verbalizations to the peer were analyzed for their social function with respect to the ongoing nonverbal activity and their temporal and topical coherence to prior talk. Six types of speech (including verbal directives and topically well-connected speech) increased in frequency only after the peer partners had shown a marked increase in their readiness to imitate each other's nonverbal actions. These same types of speech occurred reliably more often when the peers were engaged in bouts of coordinated action generated largely by means of nonverbal imitative acts than during bouts of less coordinated nonverbal activity. Toddlers, through their nonverbal imitative activity, appear to create joint understandings of what they are doing together that aid in their use and development of verbal means of achieving coordinated action.

This study observed 28 toddlers, longitudinally at 16, 20, 24, 28, and 32 months, reacting to an adult's programmed play overtures. Ss ! actions were coded for (a) their relation to the adult's overture (coordinated, interfering, tangential, and unrelated), (b) alternative overtures to the adult, and (c) the uses of sounds/words. Coordinated responses increased with age; most consisted of nonverbal imitation, but, with increasing age, more involved verbal imitation and verbally directing the adult. Alternative overtures also increased with age and were increasingly repeated in same or varied form. Finally, words were increasingly used to regulate the activity between toddler and adult: In their coordinated responses, toddlers increasingly described their own actions and directed the adult; in their alternative overtures, they verbally requested the adult to assume a new role. A proposed model integrates developmental changes in forming and maintaining social coordinations with changes in negotiating the topic for coordinated action.

Based on studies during the past 13 years of what transpires between young peers, lessons are drawn about the nature of human sociability and the development of social skill during the first three years of life. Peer encounters have proven especially helpful for discovering the forms of sociability and social skill the infant is capable of without the aid of a more skillful social partner.From early in infancy, children are quite sociable with peers (age-mates), both in novel play settings and in their own home or customary group care settings, both with an unfamiliar peer and with those quite familiar, both at the start of acquaintanceship with a particular peer and after many encounters with that peer. Their sociability is seen in their attraction to peers, their directing to peers of such distinctively social behaviors as vocalizations,smiles, and gestures, and the predominantly friendly nature of their behavior. Peer encounters in the absence of customary play materials refute claims that attraction to peers is a by-product of interest in toys and the inanimate spectacles peers create through their actions on toys.Distinctions should be drawn between sociability and social skills, especially interactive skills. Interactive skills are systematic ways the young child relates his/her own behavior to the details of a partner's behavior that function to facilitate such valued social outcomes as the generation of a cooperative game or a conversation or the resolution of a dispute. Observations of young peers highlight the distinctive nature of the infant's interactive skills. Social influence between peers is present from 6 months, but rarely takes the form customary for older children. Joining a peer and manipulating the same play material as the peer are rudimentary interactive skills that emerge by 12 months. Interactive skills enabling the generation of extended sequences of social interaction on a common cooperative theme progress rapidly during the third year of life.The distinctive form of the young child's interactive skills produces distinctive patterns of interaction among young peers. Their interactions are managed largely nonverbally well into the third year of life, and extended Cooperative interactions most often take the form of games in which one or both' children imitate each other's actions. Despite the predominance of imitation, their encounters are also marked by complementary role relationships. The distinctive features of peer encounters prompt speculations about the role peer encounters can play in early development.