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Our investigations are designed to work best with students at the advanced middle school through high school levels, as well as college students in general education “Astronomy 101” courses. The students in these settings span a range of ages, but have a similar level of sophistication with regard to prior knowledge of astronomy or mathematical skills. Therefore, we do not identify a grade level. You are the best judge of your students’ abilities, so we leave it to you to decide how to use, adapt, and sequence investigations.