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School districts in the US spend billions of dollars on instructional technology each year. Given this, there is a surprising dearth of evidence of its effect on student achievement. ClassLink measures student usage of instructional technology related to 6,000 applications for 1500 districts or education agencies in all 50 states representing more than 10 million students. ClassLink’s software records each time students log in to an instructional application and the duration of their activity during that session. We investigate relationships between instructional technology usage and student learning outcomes using this data.