For homework to have value it must be relevant, achievable and interesting. It should be a way of involving parents in their child's education.
Homework may take many forms: oral and written activities, collecting, reading, constructing, games or discussing TV programs. Apart from what is set by the teacher it all depends on how involved you want to be in your child's education. Building the relationship is number one. Praise their efforts, set realistic expectations and let them enjoy learning.