For educators, one of the many challenges in successfully implementing an educational intervention program is to find the right student population. Although most programs are designed for a particular student body such as low achieving students, struggling readers, or average performing students, this description is too vague for implementation. Using a popular Reading program Read 180 as an example, this paper demonstrates how to use ANCOVA and the Johnson-Neyman procedure to identify cut scores for program eligibility.#QuantitativeMethods-TheoryandDesign #2009Conference #Evaluation2009 #HowTo #Prek-12EducationalEvaluation