“time on task: The number of minutes during an hour and the number of hours during a day that students spend actively engaged in learning in the classroom, as opposed to the amount of time changing classes, chatting, or engaging in other nonlearning situations.”
Excerpted from: Ravitch, Diane. EdSpeak: A Glossary of Education Terms, Phrases, Buzzwords, and Jargon. Alexandria, VA: ASCD, 2007.