This randomized experimental study (N = 1,034) examines both the direct and the indirect effects of the Towards Working Life intervention on 2 components of adolescents' career preparation: preparedness for career choice and attitude toward career planning. The intervention comprised a 1-week workshop program, the proximal goals of which were to enhance 9th graders' career choice preparedness and attitude toward career planning. Participants were assessed at baseline and immediately after the intervention. The results showed that the intervention had directly improved the students' career choice preparedness, which in turn increased positive attitude toward career planning. Implications for both theory and practice are discussed. (Contains 2 tables and 2 figures.)