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A two-year intervention based on self-determination theory was evaluated among 348 seventh and eighth grade students in the mathematic classroom. The effects of a combined student/teacher and a student-only intervention on intrinsic and identified motivation were examined. Moreover, differences in intervention effectiveness for initially low- versus high-motivated students were examined. Compared to a control group, in the first intervention year the combined group evidenced a positive development, the student-only group a negative development, followed by non-significant developments in the subsequent year for both groups. Differences regarding initial motivation showed that initially low motivated students experienced a positive development compared to initially highly motivated students regardless of the intervention condition. The results merit discussion regarding preconditions and context for intervention success.