Dylan Wiliam recently completed a three-part webinar series for NWEA on implementing formative assessment to improve student learning. The third webinar, How to Sustain the Development of Formative Assessment Using Teacher Learning Communities, is now available on demand. From the same link you may also access the first two webinars in the series.
Wiliam is the creator of Keeping Learning on Track®, an expert on formative assessment strategies, and co-author of the essential formative assessment research review, Inside the Black Box. He served as Deputy Director of the Institute of Education at the University of London and was Senior Research Director at the Educational Testing Service (ETS). His research on developing effective teacher professional development has been influential throughout the world.