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The present study investigated (1) how social relationships with teachers and peers and self-esteem of students with social–emotional and behavioral difficulties (SEBD) in inclusive regular education (regular schools) and students with SEBD in exclusive special education (special schools) develop over time in comparison with each other and in comparison with their typically developing peers and (2) whether factors—present before students with SEBD received special education services—predicted social–emotional development in either educational setting. Thirty-six students with SEBD in regular schools, 15 students with SEBD in special schools, and 1,270 typically developing peers participated. We collected data when students with SEBD resided in regular education without additional support, and we followed the development of students with SEBD for 1.5 years with three additional measurements in either school setting. Data of typically developing peers were collected when they resided in a classroom of a participating student with SEBD. Using Bayesian statistics, we found that students with SEBD in special schools had more conflictual relationships with their teachers than typically developing peers, but these relationships improved over time. Students with SEBD in regular schools were less accepted among peers than typically developing students and peer acceptance was stable over time for all three groups. Self-esteem and development in self-esteem over time did not differ between groups. The current study shows that students with SEBD show different developmental trajectories in regular or special schools and that it is difficult to predict their social–emotional development by factors present before students with SEBD received special education services.

Many established parenting programs for children's conduct problems are delivered in groups. Various, and at times conflicting, beliefs exist about whether families fare better in groups with parents that are more similar to them, or in groups that are more diverse. We set out to test these beliefs empirically. We integrated data from four trials of the Incredible Years parenting program in the Netherlands, including 452 families (children age 2-10 years) participating in 44 parenting groups. We used multilevel regression to test whether families benefit more (or less) when they participate in a group with parents that are more similar to them in terms of ethnic background, educational level, and children's baseline conduct problems, Attention Deficit/Hyperactivity Disorder (ADHD) symptoms, and emotional problems. In addition, we tested whether relative group position effects were stronger for some families than for others (e.g., whether especially ethnic minority families benefit from groups that are more ethnically diverse). Families with more severe conduct problems benefited more, but they did not fare better (or worse) in groups where other families were more similar to them. Regarding the other group characteristics, families' relative group position did not predict parenting program effects on children's conduct problems. Our findings held across families with different sociodemographic backgrounds and different levels of children's ADHD symptoms and emotional problems. We found no evidence that parenting group composition impacts the effectiveness of the Incredible Years parenting program for children's conduct problems. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Children with aggression problems tend to interpret other’s intentions as hostile in ambiguous social situations. Among clinically referred children with aggressive behavior problems, this hostile attribution style may be relatively rigid and difficult to change, due to prevalent histories of aversive social experience and/or personal vulnerability. The present study examined the effectiveness of a cognitive bias modification (CBM) training to reduce hostile interpretations of facial expressions in clinically referred aggressive boys. We conducted two experiments: Both Study 1 (N = 59, Mage = 11.8) and Study 2 (N = 75, Mage = 11.5) showed that the training effectively reduced hostile interpretation of facial expressions. However, we found no generalization to relevant other outcomes, including state anger and aggression (assessed using a multi-method approach), and hostile attribution assessed in a game context. Taken together, this research illustrates the potential of employing the CBM procedure to reduce aggressive boys’ hostile attributions: The procedure is time and cost-efficient, and relatively easily implemented. Despite this potential, the context-dependency and generalization of effects should be better understood before the procedure can be taken to scale in clinical populations.

Two experiments tested an intervention approach to reduce young children’s hostile attribution bias and aggression: self-persuasion. Children with high levels of hostile attribution bias recorded a video-message advocating to peers why story characters who caused a negative outcome may have had nonhostile intentions (self-persuasion condition), or they simply described the stories (control condition). Before and after the manipulation, hostile attribution bias was assessed using vignettes of ambiguous provocations. Study 1 (n = 83, age 4–8) showed that self-persuasion reduced children’s hostile attribution bias. Study 2 (n = 121, age 6–9) replicated this finding, and further showed that self-persuasion was equally effective at reducing hostile attribution bias as was persuasion by others (i.e., listening to an experimenter advocating for nonhostile intentions). Effects on aggressive behavior, however, were small and only significant for one out of four effects tested. This research provides the first evidence that self-persuasion may be an effective approach to reduce hostile attribution bias in young children.

Two studies investigated whether young children's hostile attributional bias (i.e., the tendency to assume that others have hostile intentions) may be explained by a lack of intent attribution skills (i.e., the ability to correctly infer others’ intentions). We also investigated whether these intent attribution skills depend on children's false‐belief understanding. Children who lack false‐belief understanding may base their attributions on the observable outcomes of others’ behavior, rather than on others’ intentions. These hypotheses were tested by assessing intent attributions made by children ages 3–7 years. We systematically varied intent and outcome information in vignettes (Study 1, N = 151) and staged interactions with puppets (Study 2, N = 85). Results replicated across studies. Children who understood false belief (vs. those who did not) based their attributions more on intent information. However, these intent attribution skills did not affect children's hostile attributional bias. Exploratory analyses showed that children with higher levels of hostile attributional bias, more than others, based their attributions on outcome information. Thus, the findings from this research do not support the assumption that young children with a hostile attributional bias lack intent attribution skills; instead, the findings suggest that these children have a heightened sensitivity for negative outcomes.

Several studies suggest impaired executive functions (EFs) in children with externalizing behavior problems and average intelligence (e.g., IQ > 85). Even though children with mild to borderline intellectual disabilities (MBID) are at higher risk of developing externalizing behavior problems compared to children with average intelligence, it is not yet clear if impaired EFs are also associated with the occurrence of externalizing behavior problems in children with MBID. In the current study, we therefore assessed three EF components (inhibition, cognitive flexibility, and working memory) as well as processing speed in children with MBID and externalizing behavior problems (n = 71) versus children with MBID with no such problems (n = 70). This was accomplished using a well-established computerized test battery. Even after IQ was controlled for, the children with MBID and externalizing behavior problems showed more impaired working memory performance. Differences for inhibition performance and processing speed were also found but less consistent across the tasks used to measure these aspects of EF. Cognitive flexibility was not more impaired in children with both MBID and externalizing behavior problems relative to children with MBID only. Our findings highlight working memory as a potential target to enhance the treatment of children with MBID and externalizing behavior problems.

Objective. The present study examines cognitive and emotional problems in mothers being released from incarceration. Design. Participants were 98 mothers who were about to be released or had just been released from incarceration, and 63 comparison mothers from disadvantaged areas with low socioeconomic status, both with young children. Mothers provided self-report data on parenting behaviors, cognitive distortions, depressive symptoms, and socioeconomic difficulties. Results. Mothers being released from incarceration reported less optimal parenting behaviors (i.e., less involvement and poorer monitoring) and higher levels of cognitive distortions and depressive symptoms than comparison mothers. Cognitive distortions and depressive symptoms were related to less optimal reported parenting behaviors. Conclusions. Cognitive distortions, depressive symptoms, and less optimal reported parenting behaviors may be factors in incarcerated and formerly incarcerated mothers, which might put their children at risk, beyond risks associated with low socioeconomic status.

Background:For elementary school-children with aggressive behaviour problems, there is a strong need for effective preventive interventions to interrupt the developmental trajectory towards more serious behaviour problems.Aim:The aim of this RCT-study was to evaluate a school-based individual tailor-made intervention (Stay Cool Kids), designed to reduce aggressive behaviour in selected children by enhancing cognitive behavioural skills.Method:The sample consisted of 48 schools, with 264 fourth-grade children selected by their teachers because of elevated levels of externalizing behaviour (TRF T-score > 60), randomly assigned to the intervention or no-intervention control condition.Results:The intervention was found to be effective in reducing reactive and proactive aggressive behaviour as reported by children, mothers, fathers or teachers, with effect sizes ranging from .11 to .32. Clinically relevant changes in teacher-rated externalizing behaviour were found: the intervention reduced behaviour problems to (sub) clinical or normative levels for significantly more children than the control condition. Some aspects of problems in social cognitive functioning were reduced and children showed more positive self-perception. Ethnic background and gender moderated intervention effects on child and teacher reported aggression and child response generation.Conclusions:The results of this study demonstrate the effectiveness on outcome behaviour and child cognitions of an individual tailor-made intervention across informants under real-world conditions.

Children witness violence at home, at school, in their neighborhood, and in the media. Children may also experience violence, as a victim, at home, at school, and in their neighborhood. A longitudinal study tested whether children who are exposed to a heavy dose of violence come to regard it as normal behavior and subsequently behave more aggressively themselves. Participants were 777 children (8 to 12 years old) who completed questionnaires twice (6 months apart) about exposure to violence (witnessed and experienced), their own aggression, the aggression of peers, and normative beliefs about aggression. The results showed that witnessing violence predicted increases in aggression 6 months later through changes in normative beliefs. Likewise, experiencing aggression as a victim predicted increases in aggression 6 months later through changes in normative beliefs. These findings show that when children think violence is commonplace in many contexts, they are more likely to aggress against others. © The Author(s) 2011.

Most researchers have specific expectations concerning their research questions. These may be derived from theory, empirical evidence, or both. Yet despite these expectations, most investigators still use null hypothesis testing to evaluate their data, that is, when analysing their data they ignore the expectations they have. In the present article, Bayesian model selection is presented as a means to evaluate the expectations researchers have, that is, to evaluate so called informative hypotheses. Although the methodology to do this has been described in previous articles, these are rather technical and have mainly been published in statistical journals. The main objective of the present article is to provide a basic introduction to the evaluation of informative hypotheses using Bayesian model selection. Moreover, what is new in comparison to previous publications on this topic is that we provide guidelines on how to interpret the results. Bayesian evaluation of informative hypotheses is illustrated using an example concerning psychosocial functioning and the interplay between personality and support from family.

People are strongly motivated to feel accepted by others. Yet when faced with acute peer rejection they often aggress against the very peers they desire acceptance from, which may lead to further rejection. The present experiment tests three potential mediators of aggressive responses to acute peer rejection in the critical developmental stage of early adolescence. Participants ( N = 185, Mage = 11.5 years) completed personal profiles that were allegedly evaluated online by peers. After receiving negative or neutral peer feedback, participants could aggress against the same peers who had evaluated them. Rejected participants attributed more hostile intent to the peers, were angrier, showed a greater reduction in state self-esteem, and were more aggressive. Mediational analyses showed that hostile intent attributions mediated the acute peer rejection—aggression relationship, whereas increases in anger and decreases in state self-esteem did not. Thus, acute peer rejection evokes hostile intent attributions that, in turn, lead to aggressive reactions.

Acording to social information processing theories, aggressive children are hypersensitive to cues of hostility and threat in other people’s behavior. However, even though there is ample evidence that aggressive children over-interpret others’ behaviors as hostile, it is unclear whether this hostile attribution tendency does actually result from overattending to hostile and threatening cues. Since encoding is posited to consist of rapid automatic processes, it is hard to assess with the selfreport measures that have been used so far. Therefore, we used a novel approach to investigate visual encoding of social information. The eye movements of thirty 10–13 year old children with lower levels and thirty children with higher levels of aggressive behavior were monitored in real time with an eyetracker, as the children viewed ten different cartoon series of ambiguous provocation situations. In addition, participants answered questions concerning encoding and interpretation. Aggressive children did not attend more to hostile cues, nor attend less to non-hostile cues than non-aggressive children. Contrary, aggressive children looked longer at non-hostile cues, but nonetheless attributed more hostile intent than their non-aggressive peers. These findings contradict the traditional bottom-up processing hypotheses that aggressive behavior would be related with failure to attend to non-hostile cues. The findings seem best explained by topdown information processing, where aggressive children’s pre-existing hostile intent schemata (1) direct attention towards schema inconsistent non-hostile cues, (2) prevent further processing and recall of such schema-inconsistent information, and (3) lead to hostile intent attribution and aggressive responding, disregarding the schema-inconsistent non-hostile information.

Research among adults has consistently shown that people holding negative self-views prefer negative over positive feedback. The present study tested the hypothesis that this preference is less robust among pre-adolescents, such that it will be mitigated by a preceding positive event. Pre-adolescents (n = 75) holding positive or negative global self-esteem were randomized to a favorable or unfavorable peer evaluation outcome. Next, preferences for positive versus negative feedback were assessed using an unobtrusive behavioral viewing time measure. As expected, results showed that after being faced with the success outcome children holding negative self-views were as likely as their peers holding positive self-views to display a significant preference for positive feedback. In contrast, children holding negative self-views displayed a stronger preference for negative feedback after being faced with the unfavorable outcome that matched their pre-existing self-views.

Narcissistic individuals are prone to become aggressive when their egos are threatened. We report a randomized field experiment that tested whether a social-psychological intervention designed to lessen the impact of ego threat reduces narcissistic aggression. A sample of 405 young adolescents (mean age = 13.9 years) were randomly assigned to complete either a short self-affirmation writing assignment (which allowed them to reflect on their personally important values) or a control writing assignment. We expected that the self-affirmation would temporarily attenuate the ego-protective motivations that normally drive narcissists' aggression. As expected, the self-affirmation writing assignment reduced narcissistic aggression for a period of a school week, that is, for a period up to 400 times the duration of the intervention itself. These results provide the first empirical demonstration that buttressing self-esteem (as opposed to boosting self-esteem) can be effective at reducing aggression in at-risk youth. © 2009 Association for Psychological Science.

Background A growing interest exists in mechanisms involved in behaviour problems in children with mild intellectual disabilities and borderline intelligence (MID/BI). Social problem solving difficulties have been found to be an explanatory mechanism for aggressive behaviour in these children. However, recently a discrepancy was found between automatic and reflective responding in social situations. We hypothesise that low impulse control and aggressive social problem solving strategies together may explain mechanisms involved in aggressive behaviour by children with MID/BI. Method In a clinical sample of 130 children with MID/BI receiving intramural treatment, main, moderating and mediating effects of impulse control and aggressive response generation on aggressive behaviour were examined by conducting hierarchical linear multiple regression analyses. Results Independent main effects of both impulse control and aggressive response generation on aggressive behaviour were found. Results indicated that low impulse control and aggressive response generation each explain unique variance in aggressive behaviour. Conclusions As this study is the first that has shown both impulse control and aggressive response generation to be important predictors for aggressive behaviour in children with MID/BI, future research should further examine the nature of relations between low impulse control and social problem solving.

Relations among externalizing behavior, therapeutic context (community care vs. residential care), and social problem-solving by children with mild intellectual disabilities or borderline intelligence were examined. Participants were 186 children (12 to 14 years of age) who responded to a video-based social problem-solving task. Of these, 130 received residential care and the majority suffered from severe externalizing behavior problems. The results indicated that externalizing behavior was related to encoding, generation of aggressive responses, and negative evaluation of assertive responses. Therapeutic context was related to encoding, positive evaluation of assertive responses, and negative evaluation of aggressive responses. Results indicate a discrepancy between appropriate problem-solving skills and behavior in daily life. Implications for interventions are discussed.

From the early days of psychology, theorists have observed that parents sometimes transfer their own unfulfilled ambitions onto their child. We propose that parents are especially inclined to do so when they see their child as part of themselves, more so than as a separate individual. When parents see their child as part of themselves, their child's achievements may easily come to function as a surrogate for parents' own unfulfilled ambitions. In the present experiment, 73 parents (89% women, M age = 43 years) were randomly assigned to reflect on either their own or others' unfulfilled ambitions. Results showed that, when faced with their own unfulfilled ambitions, parents who see their child as part of themselves want their child to fulfill their unfulfilled ambitions. This study provides the first experimental evidence to suggest that parents may desire their child to redeem their broken dreams.

Aggressive behavior in childhood poses a threat to society, since aggression tends to be quite stable in childhood, and aggressive children often become violent adults. One important prosocial mechanism to reduce the negative impact of aggression is reconciliation, which can be defined as friendly behavior between former opponents shortly after a conflict. This chapter stresses the importance of adequate reconciliation in keeping conflicts manageable and functional. Understanding the factors that influence reconciliation is essential to improve conflict management in children with and without disruptive behavior problems. Much knowledge on conflict management comes from animal studies. The chapter first presents the key results derived from animal studies before considering what is known about reconciliation, both in typically developing children and in those with aggressive behavior problems. Second, it highlights the importance of the social environment for the development of reconciliatory skills in both nonhuman primates and human children. Third, it discusses factors that may contribute to the ability to develop and effectively execute reconciliatory skills.

The present meta-analytic review examined effectiveness of the Incredible Years parent training (IYPT) regarding disruptive and prosocial child behavior, and aimed to explain variability in intervention outcomes. Fifty studies, in which an intervention group receiving the IYPT was compared to a comparison group immediately after intervention, were included in the analyses. Results showed that the IYPT is an effective intervention. Positive effects for distinct outcomes and distinct informants were found, including a mean effect size of d=.27 concerning disruptive child behavior across informants. For parental report, treatment studies were associated with larger effects (d=.50) than indicated (d=.20) and selective (d=.13) prevention studies. Furthermore, initial severity of child behavior revealed to be the strongest predictor of intervention effects, with larger effects for studies including more severe cases. Findings indicate that the IYPT is successful in improving child behavior in a diverse range of families, and that the parent program may be considered well-established.

In the present study the results of two meta-analyses on the effectiveness of individually delivered indicated school-based interventions for externalizing behavior problems at elementary schools are presented. A distinction was made between studies that evaluated effects of interventions with only an individual component ( k = 11 studies, n = 738 children, d = .30), and studies on interventions that included both individual and additional components ( k = 13 studies, n = 1156 children, d = .30). Both types of individually delivered school-based interventions reduced externalizing behavior in at-risk children. Moderator analyses showed individual interventions with additional components to be most beneficial for younger children. The variability in effectiveness of interventions indicates that schools need to carefully select evidence-based programs for their specific population.

Background A central tenet in developmental psychopathology is that childhood rearing experiences have a major impact on children’s development. Recently, candidate genes have been identified that may cause children to be differentially susceptible to these experiences (i.e., susceptibility genes). However, our understanding of the differential impact of parenting is limited at best. Specifically, more experimental research is needed. The ORCHIDS study will investigate gene-(gene-)environment interactions to obtain more insight into a) moderating effects of polymorphisms on the link between parenting and child behavior, and b) behavioral mechanisms that underlie these gene-(gene-)environment interactions in an experimental design. Methods/Design The ORCHIDS study is a randomized controlled trial, in which the environment will be manipulated with an intervention (i.e., Incredible Years parent training). In a screening, families with children aged 4–8 who show mild to (sub)clinical behavior problems will be targeted through community records via two Dutch regional healthcare organizations. Assessments in both the intervention and control condition will be conducted at baseline (i.e., pretest), after 6 months (i.e., posttest), and after 10 months (i.e., follow-up). Discussion This study protocol describes the design of a randomized controlled trial that investigates gene-(gene-)environment interactions in the development of child behavior. Two hypotheses will be tested. First, we expect that children in the intervention condition who carry one or more susceptibility genes will show significantly lower levels of problem behavior and higher levels of prosocial behavior after their parent(s) received the Incredible Years training, compared to children without these genes, or children in the control group. Second, we expect that children carrying one or more susceptibility genes will show a heightened sensitivity to changes in parenting behaviors, and will manifest higher emotional synchronization in dyadic interchanges with their parents. This may lead to either more prosocial behavior or antisocial behavior depending on their parents’ behavior. Trial registration Dutch Trial Register (NTR3594)

Is prosocial behavior a prerequisite for having good-quality friendships? This study (N = 477, mean age = 12.2 years) examined whether the link between children's prosocial tendencies and their perceived friendship quality was dependent on children's level of popularity in the peer group. Children's prosocial tendencies were assessed both as observed behavior in a standardized setting and as a self-reported predisposition to act in prosocial ways. Across measures, the results showed that prosocial tendencies are associated with higher perceived friendship quality among nonpopular children (i.e., children holding average or lower levels of popularity), but not among popular children. Thus, even if they lack prosocial qualities, popular children are still able to hold good-quality friendships. Popular children may have other compensating characteristics, such as popularity by association, that make them attractive for peers to be friends with.

Researchers often have expectations about the research outcomes in regard to inequality constraints between, e.g., group means. Consider the example of researchers who investigated the effects of inducing a negative emotional state in aggressive boys. It was expected that highly aggressive boys would, on average, score higher on aggressive responses toward other peers than moderately aggressive boys, who would in turn score higher than nonaggressive boys. In most cases, null hypothesis testing is used to evaluate such hypotheses. We show, however, that hypotheses formulated using inequality constraints between the group means are generally not evaluated properly. The wrong hypotheses are tested, i.e.. the null hypothesis that group means are equal. In this article, we propose an innovative solution to these above-mentioned issues using Bayesian model selection, which we illustrate using a case study.

Although there are good theoretical reasons to believe that youth who are high in alienation (i.e., estranged from society, significant others, and themselves) are prone to behave aggressively, empirical evidence is lacking. The present experiment tested whether alienation moderates the effects of acute peer rejection on aggression in youth. Participants (N = 121; mean age = 11.5 years) completed a personal profile (e.g., "How do you describe yourself?") that was allegedly evaluated online by a panel of peer judges. After randomly receiving negative or positive feedback from peer judges, participants were given the opportunity to aggress against them (i.e., by reducing their monetary reward and by posting negative comments about them online). As predicted, alienation increased participants' aggression against peers who had rejected them, but not against peers who had praised them, even after controlling for peer-nominated chronic rejection and peer-nominated aggression. Thus, alienated youth are more aggressive than others when they experience acute peer rejection. © 2010 The Author(s).

Narcissism is a dynamic form of personality characterized by a pervasive sense of grandiosity and self-importance, and by a need to obtain continuous self-validation from others. Very little is known about its etiology and development. What factors (e.g., temperament, parenting experiences) and processes (e.g., transactions between these factors over time) cause some children to become more narcissistic than others? When does narcissism first emerge, and how does narcissism develop over time? This article describes a framework for research on the etiology and development of narcissism, and recommends ten research priorities. This research should yield fundamental knowledge and should inform intervention efforts to minimize the negative impact narcissistic individuals have on themselves and on others.

Studying moderators of intervention effects is essential to elucidate what works for whom. The present study investigated whether child personality moderates short–term and follow–up effects of an individualised preventive school–based intervention for children with externalising behaviour. The sample consisted of 48 schools, with 264 fourth–grade children displaying externalising behaviour (Mage = 10.2 years), randomly assigned to the intervention (n = 191) or no intervention control (n = 73) condition. Teachers and children reported at pretest, posttest and follow–up test about reactive and proactive aggression. Child personality was assessed by teachers at pretest. Child conscientiousness moderated short–term intervention effects, indicating that more organised and planful children benefited more from the intervention. Child extraversion moderated both short–term and follow–up intervention effects, with low extraverted children showing larger effects. These results affirm the importance of including personality as moderator of intervention effects in future studies, as interventions adapted to specific child traits might yield larger effects. Copyright © 2012 John Wiley & Sons, Ltd.

Children adapt their behaviour to their social environment through adequate social information processing (SIP). According to the SIP model, social information processing is goal oriented. Yet the subjective experience of reactively and severely aggressive children seems to be that their behaviour is impelled by uncontrollable rage, with no other goal in mind than venting anger and spite. To test whether reactive and proactive aggression by severely aggressive boys were related with experiences of goal directedness, 52 highly aggressive and 30 normal comparison boys were asked to explain their responses to hypothetical provocations by peers. Both highly aggressive and normal comparison boys primarily explained generation and selection of aggressive responses to provocation situations by feeling impelled to act by strong emotions, not with reference to outcome goals. Reactive aggression was specifically related with such emotion explanations for aggression. Moreover, highly aggressive boys more frequently ...

When people reflect on their important values, they may become more attuned to the needs of others. Two longitudinal field experiments examined whether a subtle value-affirmation manipulation can initiate relatively enduring increases in young adolescents' prosocial feelings (Study 1; Mage = 12.9) and prosocial behaviors (Study 2; Mage = 12.9). Participants completed a brief writing exercise that affirmed the values they deemed either most important (value-affirmation group) or unimportant (control group). As predicted, the value affirmation, coupled with a booster affirmation 6 weeks later, caused increases in prosocial feelings and behaviors over the 3-month study period. Antisocial students who were value-affirmed showed especially strong increases in prosocial behavior. These results suggest that "gentle passions" can be aroused in youth by cost- and time-efficient means. The practical utility of value affirmations will need to be evaluated in future work.

The aim of this study was to explain adolescents' volunteering in terms of their morality and identity and to examine the moderation effect of gender and age in this process. Data were collected among 698 Dutch adolescents aged 12 to 20 (M = 15.19; SD = 1.43). Adolescents' moral reasoning was positively associated with understanding moral issues and thinking about public responsibility towards these issues. In turn, moral understanding, along with being personally committed to act upon moral issues, were positively associated with identity. Extending the number of identity contexts tended to be related to being more likely to volunteer and to more volunteering involvement. Adolescents' identity integration was not related to how likely they were to volunteer, and was negatively related to their volunteering involvement. Clearer effects were found when differentiating between adolescent gender and age groups. Future research could examine this process over time, along with additional factors that may further explain adolescents' volunteering, and examine their age and gender specific effects.

The present meta-analytic review aimed to clarify divergent findings concerning the relation between reactive and proactive aggression in children and adolescents. Fifty-one studies with 17,965 participants were included in the analysis. A significant correlation between reactive and proactive aggression was found. The strength of this relation varied considerably between studies, from -.10 to .89. Observational assessment and tilt/noise tasks were associated with smaller correlations than questionnaires. Within the large group of questionnaire studies, studies disentangling the form and function of aggression found lower correlations than studies that did not disentangle form and function. Among questionnaire studies, higher reliability was associated with larger correlations. Effect size did not depend on other study characteristics such as sample type, age, and informant type. It is concluded that reactive and proactive aggression are most clearly distinguished with behavioral observations and questionnaires that unravel form and functions of aggression.

The well-known distinction between reactive and proactive aggression is theoretically important but empirically controversial. Recently, aggression researchers have argued that we should separate the form and function of aggression to make a clearer distinction between reactive and proactive aggression. This article describes the validation of a new teacher-report Instrument for Reactive and Proactive Aggression (IRPA) that assesses the form separate from the function of aggression. We demonstrated good discriminant, convergent, and construct validity of the IRPA in a sample of 427 children aged 10 to 13. Reactive and proactive functions of aggression were independent constructs (r = 0.03) which indicates excellent discriminant validity. Convergent validity was satisfactory; scores from the IRPA were moderately to highly related to scores from the widely used Teacher Rating Instrument, TRI (Dodge and Coie in Journal of Personality and Social Psychology 53:1146-1158, 1987). Additionally, reactive and proactive aggression showed unique correlations with most a priori hypothesized theoretically relevant variables, which indicates construct validity. (150 words).