Also interesting is Durlak and Wells (1998) finding that there is increased empirical support for prevention programs that are conceptualized according to intervention level (person-centered vs. environment-centered), types of transitions encountered (divorce, school entry, etc.) and mental health promotion. This finding implies that primary prevention programs should distinguish themselves conceptually and concisely in order to be effective. Interestingly, the Passage Works program is both environment-centered and person-centered. Depending on the curriculum utilized, a particular transition is the focus. In the senior curriculum the transition is high school graduation, whereas the ninth grade curriculum focused on transition into high school from middle school.