Holt McDougal Algebra 1 Teacher's Edition 2012 Author:HOLT MCDOUGAL The teacher edition supports standards instruction through explanation of best practices, integrating the standards for mathematical practice, and directions detailing how to incorporate program components in an effective manner at point-of-use. The layout is based upon the "5 E's" of instruction: Engage, Explore, Explain, Elaborate, and Evaluate.