Copyright Statement

This work is licensed under the Creative Commons CC BY License. To view a copy of the license, visit However, this work may also contain some copyrighted content that is subject to certain license restrictions or that may be used only under the copyright fair use doctrine. Such content is identified by the © symbol or by the appropriate license description. You are legally responsible for complying with all restrictions that apply to such content.

<< Previous: Introduction | Table of Contents | Next: section I (General Guidelines) >>


Ideas that work.The DIAGRAM Center is a Benetech initiative supported by the U.S. Department of Education, Office of Special Education Programs (Cooperative Agreement #H327B100001). Opinions expressed herein are those of the authors and do not necessarily represent the position of the U.S. Department of Education.


  Copyright 2019 I Benetech

Log in with your credentials

Forgot your details?