For the past year I have initiated used a variety of data sources to teach students about their strengths and weaknesses in terms of concept mastery. During this session I will share the approaches taken, and the various sources of data including student-friendly learning targets, quiz and unit exam analysis materials, a strategy that I call “-1 analysis”, and the process used to address re-writes of unit exams. The context for the session will be chemistry, but the principles could be applied to all science subjects. Please come to idea shop, and contribute your thoughts to this ongoing work.