I've been reading the book, Mindsets in the Classroom by Mary Cay Ricci, and just finished chapter 3. It was a real eye-opener. Through all of my years of teaching, I thought I was differentiating by planning and implementing reteaching and enrichment lessons and activities as my class worked through a unit. But in this chapter, I learned how important it is to start the differentiation before the unit even begins! This process begins with the preassessment. So much valuable information can…