The tablets track the times the apps or textbook and video files are open, allowing us to draw a picture of how devices are being used and how users are progressing through materials. We view this as extremely important to monitoring, evaluating, and measuring the impact of any given deployment - since none of this is possible with paper books. 

Note that the data that is collected in anonymized form and is presented in aggregated format across a deployment - to maintain privacy while still providing useful insights on how to best design programs to maximize impact. 

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