Adolescents from grade 9 in Sydney Australia (N = 60) were interviewed regarding why they would or would not consider pursuing maths-related careers. Open-ended interview data explored the comprehensiveness of explanations within the Expectancy-Value framework. The Expectancy-Value model is the major motivational framework for explaining students' maths participation choices in senior high and college enrolments, and the present study extended participation choices to maths-related career plans. Findings provided support for Expectancy-Value factors as sources of adolescents' intentions to pursue (or not pursue) maths-related careers, and suggest extensions to the model. (Contains 2 tables and 3 footnotes.)