You know HW is always a problem in any situation and it seems to be something that drives us all nuts...well...grab that WBT oxygen tank because we've got something that may work! Are you interested?
We like to call it "Can I Have More HW, Please?". We saw a similar idea used here in Southern CA and made some tweeks and I'll give you the high points here;
1. Kids are assigned HW.
2. They come back the next day with it or with out it. You have the class broken into say groups of 6, each group is listed on a small piece of paper that will have the week days on it, a sort of check off sheet.
3. A leader in the class takes their own group and walks around to check on their own list. They simply put an X if the student did their work. (Notice...you're not doing it!)
4. On Friday you have a drawing for the kids that turned in their HW all 4 days. They are drawing WBT's (pronounced, wibbits).
4a. What are WBT's? These are rewards, each one on a small piece of paper, that cost you nothing, yes...I said nothing. Get creative. The most coveted in my class so far is "sit at the teachers desk for 10 minutes", and then "Have lunch with the teacher" (We sit together in the lunch room for a few minutes and just talk with them and their friends). Others are restroom pass, drink pass, lead the line, lead the rules, pass out papers, sit by a friend for 10 minutes, sit on your desk (or under it!) during free reading, and so on.
5. Each WBT has some fine print. They can only use the drink/restroom pass one time during the week. Each WBT must be used by the next drawing, because it needs to be drawn again the next Friday.You know your kids and can pinpoint other things that they may try and sneak by you...

Most all of them can only be used once that week, for one day. Once their done they put it back in the bucket/can/WBT holder.
6. You can allow them to trade if they want, but once Monday comes, there is no more trading.
7. If you want you can have the Golden WBT, which is no HW for one night.
This is a flexible game that you can adjust, but it improved my HW an amazing amount. Some kids that never got it in were motivated to do so.
I would start off with multiple awards of only two or three, and then add some more lucrative ones as the year goes on. Remember the Mantra...It's a long year...so you will want to spice it up every couple of week with some new WBT's.