When assigning tasks take their lists into consideration, but don't rely solely on them. They need to have jobs assigned to them that they don't necessarily want to do, but are quite capable of doing. When they leave your home, they will be responsible for all chores, good and bad. When the job is done, regardless on how it lives up to your standards, if the effort was put into it, be sure to thank them. Praise is encouraging, and will promote compliance.
Consistency is the key in almost any aspect of life.
Having a regular routine when it comes to chores and household duties makes it easier for everyone to remember what needs to be done and when. Charts also cut down on the need for prodding and reminders. Compile a list or chart and place it in a prominent place in your home. Above the message center, on the fridge, or on the inside of the cleaning supply cabinet are good places. If each person in the house has a different color, it makes reading at a glance easy.