January 13, 2021

I want to offer a special thank you to Mr. Justin Knutson, undergraduate within the online Bachelor of Science in Psychology degree program at WSU, for his edits of the 3rd edition during the spring 2020. His changes, and my own, are integrated into the 4th edition of the book and are a dramatic improvement over the 3rd edition. Thank you, Justin.

To my students over the past 3 years. Thank you for suggestions on how to improve not only this textbook, but the curriculum for the class. Due to this, I have decided to streamline the project this book will help you develop and move it to the Instructor Resources section so that other faculty using the book can choose to keep whatever aspects of the course project they wish or forge their own path. The book being standalone allows for that.

And now to my reader. I hope you enjoy the book and please, if you see any issues whether typographical, factual, or just want to suggest some type of addition to the material or another way to describe a concept, general formatting suggestion, etc. please let me know. The beauty of Open Education Resources (OER) is that I can literally make a minor change immediately and without the need for expensive printings of a new edition. And it’s available for everyone right away. If you have suggestions, please email them to myself (Lee Daffin) using the email on the title page.

Enjoy the 4th edition of Principles of Behavior Analysis and Modification.

Lee Daffin