This field-tested manual is an extension of an earlier work titled "Data-Based Program Modification: A Manual," and is designed for special education resource teachers to implement with children whose mild and moderate learning handicaps have resulted in discrepancies between actual and expected reading skills. The manual's philosophy is that teachers can improve special education services by systematically measuring student progress toward individualized education program (IEP) goals and then making adjustments to increase program effectiveness. It serves as a prescription for what to measure, how to measure, and how to use measurement data in program evaluation. A discussion of the development of measurement procedures and of such technical considerations as validity and reliability begins the manual. Procedures are provided for frequent measurement of reading from the level representing the student's long-range goals in the curriculum. Units on charting student scores and writing data-based long-range IEP goals are included, along with information on graphing the long-range goal and collecting on-going data. The final unit on data utilization provides guidance in deciding when to change the program, based on graphs of student scores. (JDD)