Free textbooks improve learning and the classroom experience
Our blog has moved to openintro.org/blog.
We’ve established that the economic market for textbook is fundamentally broken. But even without that point, there are still many excellent reasons to switch over to a free textbook. First and foremost, using an expensive resource disconnects students. The Expensive Textbook Model is presented below:
The problems that teachers encounter when using expensive textbooks can almost entirely be mitigated by using free resources. Students get immediate and perpetual access to the course textbook, including later editions. Free textbooks also encourage students to focus on learning, not whether they can afford to purchase the textbook.
While this isn’t a novel finding, we encourage you to test it out! Print out this survey for your students.
– David
OpenIntro 
thank you for this noble idea.
for many students in the resource limited settings, it is not possible to purchase textbook after textbook – and so their hunger for knowledge is not quenched.
it is very difficult to build concepts without appropriate references – and it is easily provided in opentextbooks.
Thank you! I value very much tis philosophy and generosity! It is very important to me!
Thank you for the Free Textbook, I am very satisfied with the lessons and text
Thank you so much for your sharing and Free Textbook. Fantastic! it is very important and useful for me !
Thank you very much. It is a great opportunity for poor students who cannot afford too many book fees!
Thank you so much for allowing us to use the textbook free of charge. It is much appreciated.
I am teaching an undergraduate class (consisting of around 60 students) and using this book as a reference. Thank you and I appreciate your great work!!!
Thank you for the Free Textbook, I am very happy and surprised with the resource.I hope I can get improved. Thank you again
This was by far the best Statistic book that I have read. I eventually learned statistics concepts and delicate differences between different but similar concepts. Thank you very, very much.
Thanks for free Statistics book.
Thanks for the book
Thank you for such a wonderful gift
thanks for your generosity. may you and your family always be healthy and wealthy.
Thanks a lot. Enabling people to learn for free is probably one of the best things one can do 🙂
Thank you for enabling students like me who can’t afford all these resources to obtain it and WITH guidance from a teacher. I am forever grateful and are more motivated to excel.
Thank you so much for your sharing and Free Textbook.it is very useful for me !
Thank you for providing course materials absolutely free
Thank you for the thoughts and actually trying to make a difference.
Thank You for the OpenIntro Textbook.
I’m very happy to use your textbook for free. Thank you very much.
Thanks for free TextBook…as a student I completely agree with the” freetxtbook-model” advantages
thank you！
Thank you so much for doing this for us.
Thank you for sharing this book with us! Much appreciated!
Thankyou for sharing
Thank you sir, this book is really helping me in my job experience.
Thank you so much sir, This book is very helpful for resolving my daily office problems
thanks for allowing me to read a free text book Paul from Ecuador
Thank you so much for the open source content. I appreciate it as it has allowed me to focus on the class instead of trying to ask students to borrow their books or study with them until I can afford mine.
Thank you so much for the free book!
Thanks for the book. You made it so easy for us.
Thank you for allowing students around the world to access a so useful content, freely.
Thank you so much !
Thank you so much for the book and the opportunity to learn statistics which I believe is very useful for further research!
Thank you for sharing this text!!
thank very its well helpul
Thank you for sharing this textbook.
Thank u so much for sharing the book for free,just downloaded the book, it is going to be an amazing journey
Thank you very much to share this book with us and I really learn a lot from it! 🙂
Love open resources! Thank you for providing this book for us!