Teachers frequently struggle to cope with conduct problems in the classroom. The aim of this study was to assess the effectiveness of the Incredible Years Teacher Classroom Management Training Programme for improving teacher competencies and child adjustment. The study involved a group randomised controlled trial which included 22 teachers and 217 children (102 boys and 115 girls). The average age of children included in the study was 5.3 years (standard deviation = 0.89). Teachers were randomly allocated to an intervention group (n = 11 teachers; 110 children) or a waiting-list control group (n = 11; 107 children). The sample also included 63 'high-risk' children (33 intervention; 30 control), who scored above the cut-off (>12) on the Strengths and Difficulties Questionnaire for abnormal socioemotional and behavioural difficulties. Teacher and child behaviours were assessed at baseline and 6 months later using psychometric and observational measures. Programme delivery costs were also analysed. Results showed positive changes in teachers' selfreported use of positive classroom management strategies (effect size = 0.56), as well as negative classroom management strategies (effect size = −0.43). Teacher reports also highlight improvements in the classroom behaviour of the high-risk group of children, while the estimated cost of delivering the Incredible Years Teacher Classroom Management Training Programme was modest. However, analyses of teacher and child observations were largely non-significant. A need for further research exploring the effectiveness and costeffectiveness of the Incredible Years Teacher Classroom Management Training Programme is indicated.

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Conduct problems in school settings can pose significant challenges for both children and teachers. This study examined the teacher-reported prevalence of conduct problems in a sample of young children (N ¼ 445) in the first two years of formal education. A secondary aim was to assess teachers' perceptions of child behaviour and their classroom management strategies. The study was undertaken in 11 schools located in south west Ireland. Overall, children displayed positive socio-emotional and behavioural adjustment, although more than one-quarter had difficulties outside the 'normal' range. Class size and gender were shown to play a role in the level of difficulties experienced. Teachers reported significant challenges in managing classroom behavioural problems. This study provides some useful insights into the socio-emotional and behavioural needs of school-entry age children. The findings also have important policy and practice implications for school psychologists and other key school personnel and highlight, in particular, the need to develop and implement early intervention and prevention strategies in schools.

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