Using student cost ($) savings as a primary metric for gauging success in an OER important is common, as it should be. But a word-of-mouth average is only as good as its supporting information and statistics. How did we get this figure?
Amy Hofer at OpenOregon went through the trouble of summarizing the supporting evidence for the widely-used $100 per textbook figure.
It would be very handy to have an agreed-upon dollar amount that we could all use when calculating savings that result from OER adoptions. Many institutions rely on an estimate of $100 per student, per course. This post explains why that is a fair estimate.
Amy goes on to describe the different methods various folks have used to calculate student cost savings, being sure to mention that the most useful calculation will depend on which data is actually available. Having a reasonable median figure to refer to when discussing realistic cost savings is key, so this roundup of supporting evidence is greatly appreciated.
Thanks to Amy Hofer and @OpenOregon.