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The unique context of this study provided an opportunity to examine the effects of a short-term follow-up PD on 16 middle and high school science teachers in rural schools and their student outcomes after their participation in a comprehensive PD the previous year (PD1). The results showed sustained effect sizes a year after PD1 suggesting the impacts on the teachers’ outcomes due to their participation in a follow-up PD (PD2). Results of student outcomes showed clear differences between middle and high school students in the effects of their teachers’ participation in the two PDs.