I have notice (after handing out) any topic of paper work to the class, most students just place that paper work away. But once I start, and bring up (what said topic) is about, they wake up. But not all students, read or at less look at it. To keep students focus, show why these "handout" are good for like: reference, the next test, or projects, and how it must be used. Not all topics are in books so "handout" are the next best think.