Carl Veater joins us in the studio this week. He has spent a large amount of time examining the “Progressions” documents that were the genesis of the standards that have become the California Core State Standards in Mathematics. These document outline how several content themes are coherently linked through the grade levels and were in fact constructed in this manner for the first time in the Standards era of education. Carl describes how teachers can make use of these threads to make curricular decisions, and most importantly how to decide which topics are not specifically warranted for their grade or course level. A very engaging topic for teachers concerned with how to decide what to keep and what to let go of in order to address at appropriate depth the core topics in their curriculum.