This is the second year I have used Lucy Calkins Units of Study for writing. I absolutely love it! I was lucky enough to have additional training this summer from the Teachers College Reading & Writing Project. The trainer suggested that I try the unit Writing Like Scientists that is in the If/Then unit. It fit right along with the Core Knowledge plant and harvest unit as well. I loved teaching this unit. The students LOVED it and really got into collecting nature items. They brought in things to write and learn about as well.