Puberty is the process of becoming sexually mature and it has fundamental somatic and psychosocial implications. The focus of this dissertation was the short and long term developmental significance, concerning both soma et psyche, of female pubertal timing. Four studies were designed to accomplish these aims. Six samples of different ages from different countries and from different time points, comprising several thousand females some of which were followed longitudinally, were used. Age at menarche was used as the primary measure of pubertal maturation. The first main aim of this dissertation was to explore the mechanisms that might explain the well-established link between female pubertal timing and problem behavior, and to identify contextual conditions at which associations are stronger or weaker. Existing explanations are unsatisfactory and little is known about conditions that might affect the strength of the associations. In Paper I, we tested and confirmed a peer socialization hypothesis as a satisfactory explanation for the link between early puberty and problematic adjustment. In short, this hypothesis posits that early developing girls associate with older peers and boyfriends because they feel more mature than their same age peers, and through these peers and boyfriends the early developed girls are channeled into more socially advanced behaviors, including normbreaking. This should be particularly true in contexts where heterosexual relationships are sanctioned and where there is an abundance of deviant youth. In Paper II, I used a biopsychosocial approach and studied pubertal timing along with self-perceptions of maturity and early romantic relationships. The findings revealed that early puberty had very different implications depending on the psychological and social contexts in which it was embedded. For instance, when early puberty was coupled with feeling mature and having early romantic relationships, it was associated with adjustment problems. When early puberty was coupled with neither, it was not linked to particularly high levels of problem behavior. In stark contrast to the vast literature on the role of female pubertal timing in adolescence, the literature on long-term implications is remarkably limited. For this reason, the second main aim of this dissertation was to study the adult implications of female pubertal timing. In Papers III and IV, we examined long term implications of pubertal timing, particularly as it relates to somatic development. The findings suggested that pubertal timing does have future implications for women’s body perception and composition, with early developing females having higher body mass indexes in adulthood, but only under certain circumstances. The findings of this dissertation help further understanding of the soma et psyche implications of female pubertal timing. They indicate that pubertal timing has concurrent and future implications. It seems, however, that timing is not everything. The developmental significance of female pubertal timing appears to be very different under different contextual conditions. Thus, it is only when girls’ psychological and social contexts are considered that fruitful predictions can be made. As such, the findings have important implications for prevention, policy, and practice.

This thesis explores young children's constructions of social identities and the implications these may have in young children's everyday lives at nursery. One of the unique elements of this thesis is the multiple and intersectional approach that it adopts while exploring very young children‘s social identities and peer relations. It also explores the links between children's experiences and views with educators' social justice and equity pedagogies. Recent attention has been given to the importance of early childhood and young children's rights and participation in theory, research and policy. In the field of social identities, there has been a growing need for further research to explore the contextual, fluid, complex and intersected nature of young children's social identities, moving away from 'static' and 'fixed' notions of identity. Particular gaps have also been identified in relation to exploring age as part of social identity, to exploring cultural aspects of ethnicity and lastly to exploring multiple understandings of parts of social identities (e.g. multiple 'masculinities' and 'femininities') in early childhood. There has also been a need for further research to explore how young children‘s intersected social identities may impact on pedagogies. This thesis, therefore, seeks to explore the above, basing the analysis on a one year ethnographic and participatory approach which was conducted in two nursery settings in Scotland, one predominantly white and one multi-ethnic. It draws on a plethora of rich and in-depth conversations and experiences with young children, educators and parents/caregivers to suggest the complex, dynamic, context-specific, fluid but also 'experientially fixed' and intersected nature of children's social identities and relationships, and to acknowledge the challenges that are raised both for early childhood practice and policy. It suggests that children construct multiple and complex social identities which are both fluid and experientially 'fixed', engage in dynamic social relationships and express complex and multiple implicit/explicit discriminatory attitudes, which educators are unaware of or choose to disregard. In most cases, age and gender were part of an overt and explicit identification, and were explicitly and overtly discussed as factors of exclusion by both educators and children. In contrast, ethnicity involved a much more complex process. Although ethnicity was often part of an 'ethnic habitus', variations occurred in relation to the extent to which children developed a strong, explicit and overt ethnic identification. Ethnicity was also considered a rather 'taboo' subject of reference regarding exclusion. Moreover, this thesis suggests that discourses of ‗sameness‘, ‗normalities‘ and difference linked to constructions of social identity were salient in children's lives. Common social identities often promoted positive feelings of belonging and reinforced positive feelings of group membership and self identities between children. Strong and positive feelings of self and group identity and difference, or else ‗the other‘, although not exclusively, were very much considered the basis for exclusion and discrimination. However, complexities arose when the concept of the ‗other‘ changed, depending on the context. Difference was seen more positively by children when it constituted part of what was considered 'norm' or dominant. Traditional developmental approaches and children‘s rights-based approaches seem to influence educators‘ practice; however, irrespectively of the educational approach, educators tend to disregard implicit/explicit discrimination that is evident in children's lives. 'Too young to notice' and 'no problem here' attitudes seem to dominate educators‘ practice and raise limitations in dealing adequately with social justice and equity issues. Firstly, this thesis suggests the need to move away from 'dualistic' and oppositional dichotomies that seem to have dominated contemporary research and theory, both in relation to theorising children‘s social identities (e.g. 'fixed'/fluid) and theorisations of childhood (e.g. agents and mature / interdependent and immature). Secondly, there is a need for early childhood pedagogies, practices and policy to 'listen' more actively and closely to young children and to engage with the complex and dynamic nature of their social relationships. It is thus suggested that current early childhood practice should actively promote children-rights based approaches. At the same time, this thesis considers whether we should be moving towards a children‘s human rights-based approach, which promotes children‘s rights and goes beyond children's participatory rights, engaging more actively with issues around fairness, unfairness and respect. This thesis also argues for proactive, anti-discriminatory, reflexive and interventionist social justice and equity approaches in early childhood. Thirdly, there is a general challenge both in policy and practice regarding balancing between universalism (collective identities) and specificity (diversity).

The aim of this study was to investigate the role of personal, social and citizenship education (PSCE) in fostering positive self-esteem in two instrumental case studies which took place in two classrooms of 7-10 year old children (N=40) in France during the 2007-2008 school year. The study used a mixture of quantitative and qualitative methodologies including a self-esteem survey administered to pupils in the two case-study classrooms as well as to students in two control classrooms (N=47) at the beginning and end of the school year. Throughout the course of the year a series of semi-structured interviews was also conducted with six focus children selected from each class (2 high, 2 medium and 2 low self-esteem children) as well as with the two class teachers and the parents/step-parents of the focus children. In addition, the study included non-participant observation which focussed on the participation and behaviour of the focus children during PSCE lessons and other lessons through the use of three separate observation schedules. The study found evidence of the important influence of significant others, in particular, parents, peers and teachers, on the focus children’s self-esteem. Although the quantitative analysis of the self-esteem questionnaires showed no statistically significant increase in self-esteem at the group level over time, the qualitative findings indicate that teachers’ relationship with their students, their promotion of responsibility and self-efficacy, and their careful implementation of PSCE practices contributed to increases in individual children’s self-esteem. There was also evidence that the implementation of PSCE activities contributed to improvements in children’s peer relations.

The number of children living in the context of relative poverty in western industrialized countries is increasing, while at the same time a little amount of research is conducted about the impact of relative poverty on the child’s participation and development; focused on the socio-emotional development. This systematic literature review therefore investigates the impact of environmental factors, focused mainly on structural factors, in poverty settings in western industrialized countries on children´s peer relations. The focus will be laid on children´s participation in peer relations in school activities.  Current literature published from 2012 or more recent was searched and results found were linked to theories. The findings of the articles covered several environmental aspects regarding the impact of poverty on the child and its peer relations. The results, in relation to theories, show the interwoven influences of several factors and environments. They indicate the big influence poverty has on several aspects of the child´s life. Both in this systematic literature review researched hypotheses – that the poverty setting influences the child´s development negatively and that the child shows difficulties to develop and participate in positive peer relations - can be confirmed. Future research should aim at generating knowledge about the impact of relative poverty on the child´s development and perceptions of holistic wellbeing. This is necessary to enhance the understanding of the impact of relative poverty on the child´s participation.

Girls' relationship with mathematics has been an extensive and contested area of investigation during the last 40 years, mainly in developed countries. This contrasts with the small amount of research from developing countries, where the topic has been largely neglected but may present different challenges. In Chile, such lack of empirical evidence is surprising, particularly because of several national reports describing attainment differences in the national assessment test (SIMCE), where girls are consistently outperformed by boys. Currently, there are no studies which systematically explore gender differences in attainment in Chile. In addition, only a small number of studies have tried to explain why these differences, as well as others in engagement, attitudes and enrolment in mathematics, arise in this country. The main goal of this thesis is to critically examine these issues by investigating how girls relate to mathematics during early adolescence in Chile, and how such relationships are influenced/mediated by certain social variables (e.g. social class, classroom cultures and peer group identities).In order to do this, this thesis has adopted a mixed methods approach, thus linking analysis and results from studies that use both quantitative and qualitative methodologies. Firstly, I investigate the size and distribution of the gender attainment gap in Mathematics in Chile using a Multilevel approach to analyse data from the national census of educational quality (SIMCE). Here, I analyse the naturalization of gender differences based on results, and conclude that differences found in attainment between boys and girls are small and dependent on socioeconomic status. I then explore how girls' subjective relationships with mathematics are constructed, and how different social influences mediate this process. Using the concept of Mathematical Identities [MIs] as a main tool I explore the influence of social variables on the construction of girls' MIs in Chilean classrooms and I also consider how teaching practices and peer social relations in the classroom mediate these identities. A key finding here is the positive relationship between students' perceptions of their teaching as student-centred and more positive MI, which is in fact the same for girls and boys. A second key finding is that both representational and enacted aspects of girls' MI are mediated by their relationship with peers and peer groups. This mediation process can be described as a negotiation of different forms of belonging to social groups, which involved also the negotiation of different MIs inside the classroom. The main conclusion of this thesis is that in order to understand the role of gender in mediating girls' relationships with mathematics, we need to acknowledge the profoundly situated nature of this relationship in the cultural practices of the classroom, including mathematical practices, but also peer group practices. This argues against discourses that essentialise and naturalize 'gendered relationships with mathematics' which appear to be pre-dominant in the collation of national assessment data (like SIMCE) where categories such as gender, class, ethnicity etc. are viewed as causal or explanatory rather than produced 'in practice'.

<p>Puberty is the process of becoming sexually mature and it has fundamental somatic and psychosocial implications. The focus of this dissertation was the short and long term developmental significance, concerning both soma et psyche, of female pubertal timing. Four studies were designed to accomplish these aims. Six samples of different ages from different countries and from different time points, comprising several thousand females some of which were followed longitudinally, were used. Age at menarche was used as the primary measure of pubertal maturation. The first main aim of this dissertation was to explore the mechanisms that might explain the well-established link between female pubertal timing and problem behavior, and to identify contextual conditions at which associations are stronger or weaker. Existing explanations are unsatisfactory and little is known about conditions that might affect the strength of the associations.</p><p>In Paper I, we tested and confirmed a peer socialization hypothesis as a satisfactory explanation for the link between early puberty and problematic adjustment. In short, this hypothesis posits that early developing girls associate with older peers and boyfriends because they feel more mature than their same age peers, and through these peers and boyfriends the early developed girls are channeled into more socially advanced behaviors, including normbreaking. This should be particularly true in contexts where heterosexual relationships are sanctioned and where there is an abundance of deviant youth. In Paper II, I used a biopsychosocial approach and studied pubertal timing along with self-perceptions of maturity and early romantic relationships. The findings revealed that early puberty had very different implications depending on the psychological and social contexts in which it was embedded. For instance, when early puberty was coupled with feeling mature and having early romantic relationships, it was associated with adjustment problems. When early puberty was coupled with neither, it was not linked to particularly high levels of problem behavior.</p><p>In stark contrast to the vast literature on the role of female pubertal timing in adolescence, the literature on long-term implications is remarkably limited. For this reason, the second main aim of this dissertation was to study the adult implications of female pubertal timing. In Papers III and IV, we examined long term implications of pubertal timing, particularly as it relates to somatic development. The findings suggested that pubertal timing does have future implications for women’s body perception and composition, with early developing females having higher body mass indexes in adulthood, but only under certain circumstances. The findings of this dissertation help further understanding of the soma et psyche implications of female pubertal timing. They indicate that pubertal timing has concurrent and future implications. It seems, however, that timing is not everything. The developmental significance of female pubertal timing appears to be very different under different contextual conditions. Thus, it is only when girls’ psychological and social contexts are considered that fruitful predictions can be made. As such, the findings have important implications for prevention, policy, and practice.</p>

<p>Viewing peer relations as markers of children’s adjustment, the present thesis examined the associations between disruptive behavior problems (i.e., symptoms of Attention Deficit Hyperactivity Disorder [ADHD] and aggression) and peer relations. A second aim was to examine how children’s cognitive functioning and view of self and of their social standing are associated with their peer relations and interactions. Gender differences in the above relations were also examined. The findings indicate that although disruptive behaviors are related to poor peer relations, low levels of prosociality (Study I) and poor cognitive functioning (i.e., poor executive functioning; Study II) exacerbate children’s peer problems. Further, overly positive perceptions of one’s social acceptance and low global self-evaluations were both related to aggression within the peer group (Study III). As regards gender differences, high levels of symptoms of ADHD and poor executive functioning, had graver consequences for the peer acceptance of girls’ than of boys’ (Study I and Study II) indicating that these characteristics may not fit the cultural stereotype for girls. Results are discussed in terms of viewing poor peer relations as indicators of problematic adjustment, and also, in terms of assessing the particular significance that peer relations have for children’s self-view and behavior within the peer group. Implications of the findings as regards the interactions between behavior, cognitions, and gender on children’s peer relations are also discussed. </p>

During adolescence, peer relationships become increasingly important in various aspects of development, such as self-esteem and emotional adjustment. Unfortunately, a number of adolescents experience peer victimization, placing them at increased risk of emotional and behavioral problems. Research has consistently demonstrated the link between peer victimization and poor outcomes. However, exploration of the mechanisms underlying this link, including potential buffers of negative outcomes, is needed. The current study examined social support as a moderator of the relationship between peer victimization and maladjustment in order to assess whether social support from adults and peers protects adolescents from developing emotional and/or behavioral problems. The current study also examined disclosure of victimization to explore the role of a specific type of enacted social support in the link between peer victimization and poor outcomes. Adolescents (N = 633) in grades 10 through 12 completed a background questionnaire, the Revised Peer Experiences Questionnaire, the Child and Adolescent Social Support Scale, the Social Anxiety Scale for Adolescents, and the Youth Self-Report. Regression analyses were used to evaluate social support as a moderator of the relationship between peer victimization and internalizing and externalizing behaviors and to explore the role of disclosure. Overall, peer victimization predicted higher levels of social anxiety, anxiety/depression, and aggressive and delinquent behaviors. Strength and direction of moderation effects varied according to the type of peer victimization and source of social support and type of disclosure. The results of this study further our understanding of mechanisms underlying the link between peer victimization and maladjustment and can be used to inform prevention and intervention efforts.

Ziel der Studie war die Untersuchung individueller und familialer Faktoren für den sozialen Status eines Kindes in seiner Schulklasse. Durch die Unterscheidung von Akzeptanz und Einfluss als zweier Hauptdimensionen des sozialen Status konnte die Arbeit aufklären, welche Rolle verschiedene Attribute für das Erreichen von Akzeptanz oder Einfluss spielen. 234 Dritt- und Fünftklässler aus Berliner Grundschulen erhielten soziometrische Maße, durch welche der soziale Status erhoben wurde (Akzeptanz und Einfluss). Individuelle und familiale Faktoren wurden mittels Peernominationen über das Verhalten der Kinder (Fremdurteil), Schulnoten (Lehrerangabe)und Maße des sozio-ökonomischen Status der Eltern (Elternangabe)erhoben. Die Ergebnisse zeigen, dass Akzeptanz positiv mit prosozialem und negativ mit aggressivem Verhalten eines Kindes assoziiert ist. Die Zusammenhänge dieser Verhaltensweisen mit Einfluss wiesen in dieselbe Richtung, waren aber deutlich geringer. Ideenreichtum und Humor hingen mit Akzeptanz und Einfluss gleichermaßen positiv zusammen, sowie Traurigsein gleichermaßen negativ mit beiden Statusdimensionen verbunden war. Das Verhalten eines Kindes vermittelte den Zusammenhang zwischen Merkmalen wie Geschlecht, relativem Alter, Schulnoten und der Akzeptanz und dem Einfluss eines Kindes. Zum Beispiel war die positive Beziehung zwischen Schulnoten und dem sozialen Status überwiegend auf die mit(guten)Schulnoten assoziierten Verhaltensweisen Prosozialität und (geringe) Aggressivität zurückzuführen. Die größere Akzeptanz von Mädchen ließ sich ebenso durch deren größere Prosozialität und geringere Aggressivität erklären. Jungen waren im Hinblick auf ihren Einfluss sowohl am oberen als auch am unteren Ende der Hierarchie überrepräsentiert. Sowohl sehr einflussreiche als auch einflusslose Jungen zeichneten sich durch eine erhöhte Aggressivität aus. Komplexere Analysen wiesen daraufhin, dass Jungen negative Auswirkungen von aggressivem Verhalten durch Humor und Ideenreichtum auf ihren Status kompensieren konnten. Der moderate Zusammenhang zwischen dem elterlichen sozioökonomischen Status und dem sozialen Status des Kindes wurde vollständig durch das Verhalten des Kindes mediiert. Das Elternhaus war wichtiger für die Akzeptanz als für den Einfluss eines Kindes. Kinder mit Migrationshintergrund waren sowohl weniger akzeptiert als auch weniger einflussreich in ihrer Klasse. Elterliche Trennung trug nicht zur sozialen Position eines Kindes bei. / The goal of this study was to investigate individual and familial factors contributing to a child’s social status in its schoolclass. Separating acceptance and influence as two main dimensions of social status, this work aims at clarifying the impact of different attributes for becoming accepted or influential. 234 third and fifth grade children from Berlin schools were administered sociometric measures providing information about social status (acceptance and influence). The contributing factors where measured using peer nominations of each child’s behaviour, school-grades and familial variables such as the parents’ socio-economic status. Results show that acceptance was positively linked to prosocial and negatively linked to aggressive behaviour. Pointing in the same direction, influence was less related to aggression and prosociality than acceptance. Having ideas and a sense of humour contributed positively and being sad contributed negatively to both dimensions of social status. Furthermore, behavioural tendencies mediated the impact of non-behavioural attributes such as gender, relative age in class and school-grades on social status. For example, the positive relation between schoolgrades and social status was mainly mediated by prosocial and non-aggressive behaviour. Looking at gender, girls were more prosocial and less aggressive than boys and therefore more accepted than the latter. Within their class boys were more often represented at both ends of the influence dimension than girls. Moreover highly influential as well as powerless boys were found to be rather aggressive. More complex analyses showed that boys could possibly compensate the negative impact of aggression with humour and ideas. The moderate relation between parental SES and a child’s socials status was fully mediated by a child’s behaviour. SES was more important for the acceptance than for the influence of a child. Children with a migration background were both less accepted and influential. Parental separation did not contribute to a child’s social position.

Viewing peer relations as markers of children’s adjustment, the present thesis examined the associations between disruptive behavior problems (i.e., symptoms of Attention Deficit Hyperactivity Disorder [ADHD] and aggression) and peer relations. A second aim was to examine how children’s cognitive functioning and view of self and of their social standing are associated with their peer relations and interactions. Gender differences in the above relations were also examined. The findings indicate that although disruptive behaviors are related to poor peer relations, low levels of prosociality (Study I) and poor cognitive functioning (i.e., poor executive functioning; Study II) exacerbate children’s peer problems. Further, overly positive perceptions of one’s social acceptance and low global self-evaluations were both related to aggression within the peer group (Study III). As regards gender differences, high levels of symptoms of ADHD and poor executive functioning, had graver consequences for the peer acceptance of girls’ than of boys’ (Study I and Study II) indicating that these characteristics may not fit the cultural stereotype for girls. Results are discussed in terms of viewing poor peer relations as indicators of problematic adjustment, and also, in terms of assessing the particular significance that peer relations have for children’s self-view and behavior within the peer group. Implications of the findings as regards the interactions between behavior, cognitions, and gender on children’s peer relations are also discussed.