iv Lorie S. Atkinson Technology Teacher Elgin High School Elgin, TX J. Burton Browning Business, Engineering, and Technology Department Chair Brunswick Community College Supply, NC Kevin J. Grump CTE Teacher Oceanside High School Oceanside, CA Austin Guiswite Senior Software Developer CGI Federal Fairfax, VA Karn Gustafson Digital Film Product, CAD Architecture, CAD Engineering Teacher Volcano Vista High School Albuquerque, NM Madison Holloman Business Education Teacher Irmo High School Columbia, SC Sandra Jaworski Business Department Chair Jeffersontown High School Louisville, KY Tammy G. Neil Computer Applications and Game Design & Simulations Teacher Branford High School Branford, FL Erin L. Wasson Science and Technology Instructor/ STEAM Coordinator Jackson Heights Middle School Oviedo, FL Reviewers Goodheart-Willcox Publisher would like to thank the following people who reviewed selected chapters and contributed valuable input to this edition of Principles of Digital Information Technology.