Adolescents especially those of them in the secondary schools have been found to involve themselves in a number of aggressive behaviours that are impacting on their personality, social and academic developments. This study focuses on conscientiousness personality traits as correlates of aggression among in-school adolescents. The descriptive research of the survey type was adopted for the study. The population of the study was all the adolescents, both male (mean=15.58) and female (mean=15.62), in all secondary schools in Ekiti State, Nigeria. A total of 240 adolescents between the ages of 12 and 18 years (mean=15.60) were selected using multistage sampling technique. A self-designed questionnaire titled “Conscientiousness Personality Trait and Aggressive Behavior Questionnaire” (CPTABQ) was used to elicit information from respondents. The instrument was validated and the reliability was ensured using test re-test method. The reliability co-efficient was 0.85 at 0.05 level of significance. The data collected were analyzed using descriptive analysis for the general question raised while the hypothesis was tested using Pearson Product Moment Correlation at 0.05 level of significance. The result showed that there is significant relationship between conscientiousness personality traits and aggressive behaviour among adolescents. It also revealed that the levels of aggression and conscientiousness personality traits are moderate and high respectively. Based on the findings, it was recommended that effective counselling methods should be put in place to enhance a high level of conscientiousness personality traits and dissuade the adolescents from exposure to media that promotes aggression among the adolescents.

Keywords: Aggressive Behaviour, Conscientiousness personality traits, Counselling implication, Big Five Personality,

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