I believe student reflection is very important (and so is teacher reflection, but that is besides the point). I borrowed this idea from a fellow teacher at another school and students reflect as they are leaving our room by placing their numbered star on the posters that are labeled 3, 2, or 1. The three stands for mastery, 2 is developing, and 1 is basic. Students are familiar with this terminology because this is how we rate each learning target on unit assessments. Here is a picture from our very first reflection completed this way, which occurred a few weeks ago. It's a quick way for me to see who feels they need more instruction and those that feel they have mastered that concept and they are ready to move on.