This thesis begins by questioning the applicability of Western concepts and measures of workplace bullying to the Far East culture. Facing such an issue, the thesis aims to address the role of culture on workplace bullying by examining the emic and etic dimensions and developing an indigenous bullying scale. By emic was meant culturally specific dimension while by etic was meant culturally neutral dimension. Three studies were conducted which illustrated the emic and etic dimensions of workplace bullying. The first study was based on a questionnaire survey with 50 Korean and 43 UK employees and showed the extent of cultural differences in the employees’ concepts of and attitudes towards workplace bullying. Based upon these results, the qualitative part of the second study developed an indigenous bullying questionnaire (KBAQ: Korean Bullying Acts Questionnaire) through a repertory grid with 42 Korean participants. Then, the quantitative part of the study tested employees’ agreement of the KBAQ items being examples of bullying using a questionnaire survey with 76 Korean and 75 UK participants. Finally, the third study conducted a questionnaire survey utilising KBAQ and NAQ-R (Negative Acts Questionnaire-Revised). 193 Korean and 167 UK employees participated. The study highlighted cultural differences in the descriptive aspects of workplace bullying such as the prevalence rate, bully/perpetrator status, health outputs (e.g., job satisfaction and work-related burnout) and predictors (e.g., leadership style, role conflict, and interpersonal conflict). The results also evidenced the validity and reliability of KBAQ and revealed that KBAQ had a greater applicability for Korean employees and NAQ-R for UK employees. The consistent findings of cultural differences suggest the need for an indigenous approach in examining workplace bullying. This thesis makes a significant contribution to the literature on workplace bullying in the Far East and provides the ground for the advancement of the indigenous approach to workplace bullying research.

Depression is a complex mental health disorder, predicted to be the highest global burden of disease by 2030. Research has examined the antecedents of adolescent depression in order to limit and prevent depression from occurring. However, depression during this phase of development is multifactorial and variability in depression is characterised by important features such as the age of onset, chronicity and severity. Identifying these features, and how depressive mood changes across time along with potential risk factors may aid in our understanding of the nature of adolescent depression and help develop new interventions and treatments.

This thesis uses longitudinal methods to explore the nature of trajectories of depressive symptoms and examine how genetic and early environmental risk factors contribute to trajectories of depressive symptoms across adolescence and young adulthood in a UK population based cohort, the Avon Longitudinal Study of Parents and Children. Using group-based and multilevel frameworks, trajectories of depressive symptoms are estimated across adolescence and then various risk factors are explored to investigate how these trajectories change across time.

Genetic risk for depression, childhood bullying, female sex and

childhood trauma are all associated with less favourable trajectories of depressive symptoms. Importantly, several risk factors are associated with changes in depression across time, and not just at certain stages of development. This implies they have lasting effects and that it may be possible to identify when particular risk factors are having their greatest effect on later depression.

This work provides further evidence that depressive symptoms

across adolescence to young adulthood are complex and associated with both genetic and environmental contributions. Examining depressive symptoms across time within a longitudinal framework provides a powerful opportunity to examine the nature of depression in more detail than in previous research.

Research into student bullying in Higher Education (HE) has been limited and most is based on childhood bullying research. Bullying in HE could disrupt student mental health and wellbeing at university – a topic that has recently gained traction. Additionally, marginalised student groups may be more at risk (e.g., LGB+). Focus groups were used to explore students’ conceptualisations of bullying and identify differences between childhood and emerging adulthood (EA) bullying behaviour. Themes identified were power imbalances; tactics of HE bullying; bullying for personal or social gain, and; justifications and minimisations for not intervening (bystander intervention). Examples of bullying behaviour from this first study supplemented the childhood and adult bullying literature to create a new HE bullying scale. The scale was tested on two samples to identify the factor structure (N = 243, N =304). The third survey study (N = 441) adopted a correlational design using the developed scale alongside measures of wellbeing, childhood victimisation, and potential mediator variables, such as university belongingness, social connectedness, and Internal Working Models (IWMs). Group differences were found on victimisation, IWMs, social connectedness, and university belonging, especially for SES and sexual orientation, evidencing the disadvantages that minority groups may suffer within HE. Regression-based path-analyses found that IWMs, university bullying, social connectedness, and university belonging mediated the links between childhood victimisation and current wellbeing. Finally, UK university anti-bullying policies were examined. Policy length and quality varied between universities and a review of content is recommended based on the earlier study findings. This research has produced a new university bullying scale and has also explored mechanisms through which childhood victimisation may have negative effects on current HE student wellbeing. The importance of self- and other- beliefs as well as the social context (e.g. belonging) is stressed.

There is a body of research that emphasises the role that peers can have in either fuelling or preventing bullying behaviour. Bystanders typically reinforce bullying by joining in or passively watching (O’Connell, Pepler and Craig 1999). Social identity theory (Tajfel and Turner 1979) states that within a social group individuals are motivated to maintain a positive social identity and do so by adhering to group norms. Therefore, if bullying is normative within a group pupils are more likely to join in or passively watch (Duffy and Nesdale 2008; Gini 2006). This study evaluates the effectiveness of ‘Defeat Bullying’ (NSPCC 2007), a five week whole class anti-bullying curriculum. The overall aim of the curriculum was to create an anti-bullying group norm within the class. A pre-test, post-test non-equivalent groups quasi experimental design was employed, with an eight week follow up. Pupils aged 9-10 (year 5) from three schools in a predominately rural Local Authority (LA) in Yorkshire participated in the study (n = 69). School 1 received the intervention, School 2 received the intervention plus parental involvement and School 3 was the control group. Pupils’ reported levels of bullying, attitudes towards bullying and knowledge of how to intervene in bullying situations were measured. Questionnaires regarding the pupils’ difficult and prosocial behaviour were completed by the teachers. The impact of parental involvement on the effectiveness of the intervention was also explored. ‘Defeat Bullying’ (NSPCC 2007) did not have a statistically significant effect on any of the factors measured, which suggests there was no overall effect on the group norms regarding bullying. Furthermore, there was no statistically significant difference between School 1 and School 2 who received the intervention plus parental involvement. Possible reasons for the non significant results and the implications of this are discussed. The likelihood of changing group norms through the delivery of an anti-bullying curriculum is considered. The study raises questions in terms of whether or not parental involvement is important in anti-bullying interventions and if so what type of parental involvement is the most effective.