A high-octane meeting this week with the folk from the TALL team and their OER Impact Study http://oerblog.conted.ox.ac.uk/. It let me to sketch out the area that I think we are gathering evidence about in the Eval and Synth team, which is a more detailed picture of the two right-hand quadrants in the diagram posted below (features of open content, and aspects of open practice). On the left side are some emerging practices in learning and teaching that could arguably be called ‘open’. OERs are *involved* in these practices, sometimes as signs that they are going on, sometimes as drivers to make them happen, sometimes just in the background. So OER practices are a sub-set of these more open learning and teaching practices and it’s our task in the Eval and Synth team to gather evidence about whether and how the subset of practices promoted by UK OER are supportive of these larger movements. On the right hand side are some features of content that arguably makes it more reusable in an educational context – makes it more likely to partake helpfully in some of the practices on the left. We are familiar from UK OER pilot projects with the challenges and costs of moving content in these directions. However, we need more evidence of whether – and how – these features of open content actually support educational re-use. We have focused a lot on open licensing, which is critical for repurposing, but the focus in this phase is more on reuse and it may be that other features of open educational content are actually more significant here. The ‘E’ may be just as important as the ‘O’.