Open Access policy effectiveness: A briefing paper for research funders

"There are now almost 700 Open Access policies around the world, around one-quarter of them from research funders. There is considerable variation across these policies in terms of the conditions they lay down for authors and of their effectiveness. Based on the analysis of over 120 mandatory policies, this briefing paper lays out the main issues that affect the effectiveness of a policy in providing high levels of Open Access research material."