Each quarter, I give my students a reading log to help them keep track of their independent reading. They are expected to read a set amount of minutes per quarter (I usually assign 700-800 minutes for my 10th grade students). I also expect that the student and the parents sign off on the reading log stating the reading log is valid (i.e. they didn't cheat/lie). I also find that it motivates the students if I keep a reading log with them.