I know of a wonderful book for frustrated parents who have tried many forms of discipline or reward ideas but nothing seems to work long term. It is called: From Combat Zone to Love at Home: The Happy Face Token System, by Debbie Preece.
Debbie has raised her children with this system and wrote a book outlining the program she developed over 25 years ago. She has a great web site to show in good detail what the program is. She has effectively made an "app" for the token economy idea and explores how this program is related to the Garden of Eden.