This research investigated the reliability and validity of the Mindfields Assessment Battery (MAB), measuring three components of self-regulation (forethought, performance control, self-reflection) of young offenders. Participants were 57 12- to 18-year-olds from youth justice service centres, alternative education schools, and a youth correctional facility (N[subscript males] = 46; N[subscript Indigenous] = 7). Psychometric properties of the battery were sound with adequate alpha levels for the scales. The factor structure and internal reliability of three measures were replicated and validated. Positive significant correlations found between these subscales indicated consistent relationships with young people's responses to challenging situations. Prodelinquency scores were significantly positively correlated with minor misdemeanours and negatively correlated with social competency. Significant positive correlations were found between social competence and goal commitment, and self-regulation and life satisfaction. The battery provides a reliable, valid way of assessing forethought, performance control, self-reflection, and treatment amenability within the conceptual framework of self-regulation.