Math Workshop is a wonderful way to meet students learning needs in the classroom. Class begins with a warm up, then a short focused mini lesson, followed by small group instruction addressing students specific needs for learning mathematics. The teacher also closes the workshop by having students share out about what they are learning.
Dr. Nicki Newton has been a prominent educational consultant for this best practice. She has written books about guided math and math workshop. She also, has a new book coming out in January -Math Running Records in Action.
Another prominent author on this topic is Laney Sammons. Her book Guided Math, also has a study guide available.