1. How teachers' practice knowledge is used and challenged in a Learning Study using Variation Theory as a tool. Issue 3 (13th July 2015) Authors: Thorsten, Anja Editors: Ulla Runesson, Professor Journal: International journal for lesson and learning studies Issue: Volume 4:Issue 3(2015) Page Start: 274 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗