It works with my 8-year-old son. We have a learning/screen system set up where he has to do a learning exercise (such as math with daddy, Dual-N back or BrainPop ) to get video game time. Several times a day he will say "let's do learning/screen" to start the process. He has internalized the need to do work first before getting what he wants.
A friend of mine has a rather precocious daughter with poor impulse control, and asked if I knew any behavior games that encourage children to think out the consequences of actions before they do them.
I'm familiar with the Good Behavior Game and the like, but standard conditioning hasn't been very effective with this child in the past. She's quite clever about subverting rules when possible, and shutting down entirely when subversion fails.
Please, one suggestion per thread so that the karma thing can do its thing.