Student not turning in assignments?

So we all have that kid - the one who shows up to class every day, but instead of completing assignments puts their head down and "chills". Now they're not necessarily a behavioral issue, but they clog your focus because all we can see is that head down on the desk during classwork, or labs, or in class assignments or whatever - so how to we get them to GTW (get to work)?

Here is what I suggest:
1) Reinforcement!!! If by some miracle of the Universe they turn something in praise them for being successful.
2) Have a conference with the student and write a contract with them - be sure to have them provide the input for what the classroom expectations should be.
3) Depending on your instructional style - chart the homework turned in

What do YOU think?