Final part of a three part interview with George Siemens (following from the  first and second parts), in which he describes some thoughts about the future and nature of educational systems, and in which he has some great stuff to say about motivation and assessment in particular. I like this:

"Make things relevant to students, but also give students an opportunity to write themselves into the curriculum. That is, to be able to see the outcome of the benefits, the way in which it can make them a better person, and the way it can make the world a better place. You can’t directly motivate someone, but you can set conditions under which people of different attributes will become motivated."

Exactly so - it's about creating conditions, not about telling or controlling. It's about making and supporting a space (physical, virtual, social, conceptual, organizational, temporal, curricular, etc) that learners both belong to and own.