The development of a metric, the Accessibility Quotient (AQ), is outlined in a research article in the new Journal of Librarianship and Scholarly Communication. The authors from MIT assert:
“The AQ offers a concise assessment of accessibility for authors, departments, disciplines, or universities who wish to characterize or understand the degree of access to their research output. In combining three measures of interest to authors – price, quality, and shareability – the AQ offers a means of summarizing information about a given publishing environment in a way that is relevant to our authors and campus leaders.”
Other articles of interest include:
Reinsfelder T. L. Open Access Publishing Practices in a Complex Environment: Conditions, Barriers, and Bases of Power
Graf, K & Thatcher, S. Point & Counterpoint: Is CC BY the Best Open Access License?
“Openly” available here…http://jlsc-pub.org/jlsc/