Although the recent identification of the five critical components of early literacy has been a catalyst for modifications to the content of materials used to provide reading instruction and the tools used to examine student's acquisition of early literacy skills, these skills have not received equal attention from test developers and publishers.…

This research investigates the relative importance of vocabulary and oral reading fluency as measurement dimensions of reading comprehension as the student passes from elementary to high school. Invariance of this model over grades 4 through 8 is tested using two independent student samples reading grade-level appropriate passages. Results from…