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Authentic STEM engagement programs which are predominantly delivered by entities outside of K-12 school hours (often referred to as out-of-school time or OST) have inherent challenges when determining how to assess impact on student outcomes.This study, conducted in partnership with NASA, examines the development and validation of a new instrument designed to assess the impact of out-of-school engagement programs on middle school students' perceptions of their STEM interest, STEM identity, STEM self-efficacy, and gains in 21st Century Skills. Findings will be presented including validity evidence that supported the use of the survey to evaluate middle school students’ perceptions of their STEM Interest, STEM Identity, STEM Self-Efficacy, and 21st Century Skills.