Evaluating the effects of technology use provokes the same evaluation challenges as does any other program intervention. The issues addressed in this paper are based on experience in evaluating the achievement effects of specific technology implementations. Five previous studies of technology use and student achievement are identified in a table, each with purpose, sample/setting, method and data collection, and findings. The remainder of the paper deals with the following topics: determining the technology "input" to be measured; how to measure the amount of student use or exposure; and how to know if technology works, by measuring dependent variables. An appendix lists 10 practical Frequently Asked Questions (FAQs) about measuring information technology effects. Selected sources on measurement of instructional technology are provided. (AEF)