Two studies were conducted to investigate cross-informant measures of children's peer victimization. In Study 1, self- and peer reports of victimization were compared for 197 children from Kindergarten (M age = 5.73) to Grade 4. Before Grade 2, peer reports were less reliable than self-reports and were poor estimators of relational adjustment. In Study 2, single- versus multiple-informant (self, peer, teacher, parent) victimization measures were compared for 392 children across grades 2 (M age = 8.73) to 4. Results indicated that (a) data from the four informants were reliable and increasingly concordant over time, (b) no single-informant measure proved to be the best predictor of relational adjustment, and (c) a multi-informant composite measure yielded better estimates of relational adjustment than any single-informant measure.

The proposition that relationships make differential (i.e., unique, redundant, contingent) contributions to adjustment was examined by investigating the linkages between children's participation in different types of peer relationships (i.e., friendship, peer acceptance, peer victimization) and their adjustment to school. Relationship measures were gathered for 5- to 6-year-old children (105 males, 95 females) twice during kindergarten (i.e., fall and spring) and were correlated with adjustment indicators at each time of assessment and used to predict changes in school adjustment over time. Examination of the relative associations between the relationship measures and children's adjustment revealed evidence of both unshared (i.e., unique) and shared (i.e., redundant) linkages, depending on the form of adjustment examined. These findings suggest that adjustment may be influenced by the diverse experiences (i.e., provisions) that children encounter in different forms of relationship, and that certain types of relationships may have greater or lesser adaptive significance depending on the adjustment outcome examined.

Premises about the effects of early engagement on achievement were investigated with 383 children who were followed from ages 5.5 to 13.5. Change and continuity in behavioral (cooperative-resistant classroom participation) and emotional (school liking-avoidance) engagement were assessed during Grades 1–3 and examined within variable- and person-oriented analyses as antecedents of scholastic progress from Grades 1–8. Findings corroborated the premises that change as well as continuity in early school engagement is predictive of children’s long-term scholastic growth. Compared to children who participated cooperatively in classrooms, those who became increasingly resistant across the primary grades displayed lesser scholastic growth. Among children who manifested enduring engagement patterns, those who exhibited a combination of higher behavioral and emotional engagement across the primary grades made greater academic progress than those who displayed lower levels of these two forms of engagement. Overall, the results of this investigation were consistent with the school engagement hypothesis, and extend what is known about the predictive contributions of early school engagement to children’s achievement.

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Study aims were to: (a) describe normative levels and person‐oriented developmental trends in loneliness across adolescence, and (2) examine the association between loneliness and depressive symptoms during this same epoch. Participants included 478 youth (239 males and females; 80% Caucasian, 16% African American, and 4% other). Measures of loneliness and multiple indicators of depressive symptoms were gathered yearly across grades 6 through 12 (ages 12–18). Findings implied that most adolescents experience loneliness more strongly during early rather than later adolescence, but not all adolescents traverse the same loneliness trajectories. Youth followed one of five distinct trajectories, characterized as: (a) stable non‐lonely, (b) stable low lonely, (c) stable high (chronic) lonely, (d) moderate decliners, and (e) steep decliners. Adolescents following stable high and moderate loneliness trajectories displayed the most depressive symptoms and, although informant differences were found, these youth also manifest the largest gains in depressive symptoms over time.