Have students use post-it notes to record their thoughts at the end of a lesson. This sheet allows students to 'park' their thoughts to let you know how they are doing, to assess where your instruction needs to go to next. This form has two areas for students to record their thinking, once as something they understood, and once as something they are stuck on.
Either hand out for different lessons, or laminate one for each student to turn in with post it notes on it. With laminated option it is reusable, just remove the post it notes and distribute again. This package contains one large page to fit the 3x3 post it notes, and a small page (large divided in 2) to fit smaller post its.