I have a question related to tracking OER usage. We have a few courses where students aren't required to buy texts because of the way the course was designed but have started using open textbooks to provide students with a resource they may find useful. One example is one of our Engineering courses. There is no book required, but the instructor is going to include the new Guide to using MATLAB open textbook so students have a resource they may find useful in that course. 

My question is, would you count the students in those courses in your "students benefitting from OER" numbers or do you limit those numbers to only cases where a commercial textbook is being replaced thus saving students money?

Thank you.