This study examined the effectiveness of a new school to adult life transition planning lesson package titled "Student-Directed Transition Planning". The "Student-Directed Transition Planning" lessons teach transition terms and concepts to provide a means to increase self-determination skills and student participation in transition IEP (Individualized Education Program) meeting discussions. An experimental pre-post design utilizing random assignment of secondary-aged students with IEPs determined differences between intervention and control groups in knowledge of transition terms and concepts, and self-efficacy perceptions of the transition planning process. Study results indicated that students receiving "Student-Directed Transition Planning" instruction experienced a statistically significant knowledge gain, and an increase in perceived self-efficacy in 7 out of 10 transition planning process indicators. (Contains 5 tables.)