Cognitive bookmarks is a portable rubric using a scale 1(not understanding) to 4(can teach someone). The bookmakers are portable and can be used in small groups or mini lessons on the carpet. It is a wonderful way to track student understanding easily and efficiently.
Print out bookmarks in either color or black-n-white. Then laminate bookmarks. Place a paperclip on each bookmark. The paperclip can easily slid up and down the bookmark to mark their understanding of the concept.
Make sure to discuss with students the meaning of each level (1-4). Also, you may want to have a discussion with your class about how the bookmark helps you, as a teacher, know where students are.