The purpose of this study was to develop and gather validity evidence for silent reading fluency passages. A number of passages were written following a traditional story grammar structure (character, setting, events) and placed on a computer for students to read silently. We describe in detail, the manner in which content-related evidence was established and then present a number of statistical analyses conducted to evaluate the technical adequacy of these measures. The outcomes support the test development process and reflect a series of measures that have potential for use in measuring elementary and middle school students' silent reading fluency. Appended are: (1) Internal Review Rating Form; (2) Directions for Administration; (3) Comparison of Word Counts: Hand-Counted versus Algorithm-Counted; (4) Mean, Minimum and Maximum Words per Minute for Each Test Item; and (5) Estimated Item Difficulty Obtained from Rasch Item Response Model. (Contains 13 tables and 1 footnote.)