Carnegie Learning

Our math department is looking at the Carnegie Learning program for Common Core algebra 1.  We like the overall flow of the books, we also like how modeling and problem solving are built right into the philosophy of the presentation.  I also like a quote from the first chapter "Mathematics is the science of patterns and relationships".  They start off with patterns so there is a connection between the course and making predictions with math.  We have a few sample books, we will also be checking out the Cognitive Tutor program.  If anyone has any comments on their implementation of these materials, I'd like to hear them.