This study concerned standardization and refinement of an instrument to measure assertiveness in adolescents, and use of that instrument to compare alternative-school students with each other and with students in a traditional school. Most instruments measuring assertiveness are normed on white adult populations. Of the few designed for adolescents, only the Adolescent Assertiveness Discrimination Test provides a tripartite breakdown of subject responses into aggressive, passive, and assertive responses. The test is unpublished and is in the process of standardization and refinement. Multiple linear regression procedures were used to test the three hypotheses. Each hypothesis was tested four times on different groups (alternative versus traditional school students; dropouts versus disciplinary referrals) and on different instruments (AADT; A Scale). Hypothesis 1, which stated that demographic variables, and their interactions with school group, were related to assertiveness, was not supported. Hypothesis 2, which stated that the demographic variables were related to assertiveness, was not supported. Investigations into which of the demographic variables singly contributed to assertiveness showed that gender was significant. Females scored higher on the AADT and males scored higher on the A Scale. Hypothesis 3, which stated that school group was related to assertiveness, was supported on all comparisons except between dropouts and disciplinary referrals on the A Scale. Traditional school students scored higher on the AADT, and alternative school students scored higher on the A Scale. However, of all groups, dropouts scored highest on the AADT.