ABSTRACTStudies consistently show the demand among adolescents for structured career guidance support programmes. This study evaluated the effectiveness of the career guidance workshop intervention by examining changes in career self-efficacy, outcome expectations, and career goals with 47 high school students in grades 10–12 (aged 16–18 years). Based on a five-step model including self-awareness, career exploration, school and career paths, real encounters, and decision-making, the career guidance workshop combined lectures, discussions, individual activities, and pair and group work. Data were collected through career self-efficacy, outcome expectation, and career goal questionnaires and analysed using a pre- and post-test design with a single intervention group. Results suggested a significant improvement in participants’ career self-efficacy and their career goals. Although the findings on outcome expectations were not significant, the findings also showed an increase after the intervention. Thus, career guidance intervention is considered a valuable basis to improve adolescents’ career decision-making skills.