This article reviews "The Early Reading Diagnostic Assessment, Second Edition" (ERDA-Second Edition), a norm-referenced individually administered diagnostic measure of early reading skills as described in Reading First federal legislation (Part B, Subpart 1 of the Elementary and Secondary Education Act as amended by the No Child Left Behind Act of 2001) for K-3 children. "The Early Reading Diagnostic Assessment, Second Edition" is a content-enhanced and renormed update of the ERDA-R (The Psychological Corporation, 2002a) and designed for administration by classroom teachers. Published by Harcourt Assessment, the ERDA-Second Edition is intended to address the following purposes: (a) provide norm-referenced assessment in five dimensions identified in Reading First; (b) diagnostic measurement of students present reading abilities; (c) a guide for differentiated instruction in grades K-3 reading; and (d) a means of identifying relevant interventions. It represents the most recent in a series beginning with the publication of the ERDA 2000, followed by ERDA-R in 2002. The ERDA-Second Edition and its predecessor were adapted from four well-known and widely employed reading tests: (1) Wechsler Individual Achievement-Second Edition (WIAT-II; The Psychological Corporation, 2002b); (2) Process Assessment of the Learner: Test Battery for Reading and Writing (Berninger, 2001); (3) Test of Word Knowledge (Wiig & Secord, 1991); and (4) Metropolitan Achievement Test (Harcourt Educational Measurement, 2001).