Producing this textbook would not have been possible on my own. I am deeply grateful to Tanya Cumberland, who skillfully served as copyeditor, and layout designer. Her skill in editing, as well as her understanding of the field, gave her valuable insight that I heeded in making many editorial decisions.

I am also grateful to the authors of the chapters, particularly those who authored new chapters for this book, because without quality content, there could have been no book.

Finally, I acknowledge the wonderful contribution of students in the Brigham Young University Instructional Psychology and Technology program who contributed author biographies, graphical elements, and other additions to the book.