Arizona seventh-grade students were polled in 1997, 1998, and 1999, to determine the extent of their participation in career awareness and exploration activities, the impact that the activities have had, and how they were delivered. Survey results provided evidence of systemic change in the regional school-to-work (STW) partnerships. Further, data suggested that the way career awareness activities are delivered makes a difference in their effectiveness. The comparative survey conducted in 1999 supported the contention that STW students differed from their classmates and that STW made a difference for students. The regional analysis compared randomly selected classrooms over 3 years. Changes between 1997 and 1999 were measured in participation metrics and the role of adult mentors. The relative share of students who had at least some idea of their career interests was consistently high (86.8 percent). The mean number of STW activities per pupil increased significantly and the share of students participating in five types of activities rose. A key finding supported over the 3-year period was that students who participated in a variety of activities were better able to identify their career interests. The role of adult mentors intensified. The share of students who talked to adults about careers, and who discussed careers with a counselor, increased significantly between 1997-99. (YLB)