Children and discipline is a double edge sword. If you try to instill values in a child and educate them through punishment, they learn through negative feedback and a huge expense to their self confidence. If you reward in the wrong way, you educate them to behave only for incentive which has a negative effect as well. There is a balance, however.
Educators have learned that child behavior is best formed through structure and building a sense of accomplishment. Reward is acceptable if tied to accomplishing a series of tasks. the type of reward is very important, however.
Through the use of a formal reward chart , parents and educators can created a structured week for their child that clearly defines expectations for behavior as well as activities. The system allows for the ups and downs in a child's week as the end goal is accumulating enough stars to achieve their goal. If a goal is achieved, the reward should not be a material good. Rather, it should be a privilege or an extension of a privilege they enjoy. This could include a play date with a favorite friend, extra play time with a toy they enjoy, or a special activity with a parent or relative.
Reward charts were actually designed in backlash to the concept of a behavior chart which focuses on punishment for poor behavior. The use of positive behavior modifiers like reward charts and other educational toys are very effective in shaping your child.