C.J.
We had all the tools but he wasn't down with the whole idea. Give him time. Once mine caught on (after he was 3.5 years old) he was off to the races.
Dummy me just ASSUMED all kids UNDERSTOOD 'rewards' but I was WRONG,WRONG,WRONG!
BUT once he GOT IT that child would produce the smaaaaalest poop to earn his new reward. We almost went broke but it was worth it and saying goodbye to diapers which was much more exciting than I thought it was going to be.