Teachers use this information to annotate "equity cards,"which are a key tool for everyday classroom instruction.  "Equity cards" allow teachers to solicit non-voluntary responses from students in class.  Best practice in, say, a social studies class, would be to present students with a reflective prompt ("Which disagreements between Federalists and Anti-Federalists still exist in present-day American politics?" e.g.).  Students are first given a set amount of time to think, then a few minutes to discuss in pairs with a seat partner.  Finally the teacher would use the "equity cards" (pulled at random) to call on students to share their responses with the class.  Think -> pair -> share.  It's a great way for teachers to assess how well their students are understanding the material in a class where students have mixed ability levels -- and adjust instruction to ensure all students are progressing on pace.