I would describe the CPM curriculum as simply "refreshing." I have just finished my 20th year of teaching, and my first year of teaching Geometry Connections. As I prepared for my geometry classes, I was often amazed at the approach CPM used for concepts. For example, in my traditional geometry classes, students would memorize the distance formula, and do problems mindlessly. Now with CPM, students use a right triangle with the Pythagorean theorem. It makes sense to them.