Cross-Age Tutoring and School Store, two courses combining classroom learning and application of specific skills outside the classroom are evaluated. Students in Cross-Age Tutoring were taught tutoring and communication skills and spent four days per week tutoring at nearby elementary schools; students in School Store were taught business and interpersonal skills and operated an on campus store. These courses are examples of the "Alternatives" or "Service Opportunities" approaches to substance abuse prevention. The general goals of the courses were to foster positive attitudes and behaviors regarding self, peers, and school. These changes were expected to reduce, in subsequent years, student acceptance and use of psychoactive substances. Process data included: a survey of participants at the end of the course, observation of selected course sessions and practica, and interviews with teachers and some students from each course. Both courses (including practica) were well received by the students. Analyses of covariance did not reveal a coherent pattern of treatment effects. The lack of treatment effects was attributed to a possible failure of the courses to require sustained effort for mastery of goals, and to stimulate adequate commitment among the participating students. (Author/GK)