Teacher Direct Instruction where the teacher gives min-lessons to small groups.
Proof Place where students use manipulatives and drawn examples to explain their answers.
Practice Plaza where students practice difficult concepts and reflect on their work.
The Shop where students apply math concepts to help Mr. Fuddle run his store or shop for items.
Project Place where students use math and connect it to a larger world that includes topics of high student interest.
There is a lot more detail provided in the book as to the specifics of organizing these stations. I'll just emphasize that these stations not only provide lots of opportunities for giving students work at their readiness level, but they present math problems in a variety of contexts which truly builds understading.