Instructional Improvement Cycle: A Teacher’s Toolkit for Collecting and Analyzing Data on Instructional Strategies Regional Educational Laboratory Central (ED), National Center for Education Evaluation and Regional Assistance (ED), Marzano Research Laboratory, Cherasaro, T. L., Reale, M. L., Haystead, M., & Marzano, R. J. (2015). Instructional improvement cycle: A teacher’s toolkit for collecting and analyzing data on instructional strategies. REL 2015-080. Regional Educational Laboratory Central.