In this technical report, we present the results of a study to gather criterion-related evidence for Grade K-1 easyCBM® reading measures. We used correlations to examine the relation between the easyCBM® measures and other published measures with known reliability and validity evidence, including the Dynamic Indicators of Basic Early Literacy Skills (DIBELS), the Test of Word Reading Efficiency (TOWRE), and the Comprehensive Test of Phonological Processing (CTOPP). The correlation between easyCBM® and comparator measures ranged from a low of rs = 0.39 to a high of rs = 0.86 for Grade K and a low of rs = 0.04 to a high of rs = 0.95 for Grade 1 The easyCBM® fluencybased measures had high correlations with comparator measures (r =0.79-0.95).