D.B.
This is a good article on that very thing:
http://raisingchildren.net.au/articles/chores_for_school-...
But I think routines do keep us sane. My husband of almost 27 years just walked out on us and without routines my kids and I would feel even more lost. It gets us going, keeps us focused on other things. Kids thrive on routine. They do so much better if they know what is expected of them and what to expect.
You may want to do things like Monday is vacuum day so all things must be picked up on Sunday night before bed.
Wednesday Wash Day--laundry day. Things like that. And factor in a free day once a week.
They are old enough to help with dinner, cooking & set up/clean up. My kids love to do that. Now that I have older kids (I have 5, 3 are out of the house, and I have an 18yodd and 13yods at home) they take one night a week and cook the entire meal.
Charts are always good, kids love stickers. Come up with rewards for X amount of stickers, doesn't have to be expensive or even anything that costs money. Extra time on the TV/game, park with Dad.
You are helping them to become self-sufficient adults. I see far too many teens/young 20's that can boil an egg, clean a toilet or organize themselves. It's a shame.
Best of luck to you.