Ming, i'm a failure at that. Lolz... only managed to train korkor when he's 3... and now didi still cant really talk... so i'm not planning to start anytime soon...
during korkor's time... we got him to communicate everytime he needs to pee. Then i had to buy him underwear in characters that he like... (that time was thomas the train and barney...) so can trick him to wear them easier... it started with pee first and once he's able to tell us accurately when he needs to pee, then we move to poo... yes, he refuse to poo in the toilet bowl even if he can tell us when he wants to pee so we still had to bring pampers out... he will only want to poo in pampers. haiz... after a few months and with much encouragement... then he managed to pee and poo during daytime on his own... i didn't immediately start the night training.. we delayed another 6mths then start night training...
somehow... i think they themselves must be prepared before they can. For korkor... he seems to be able to gasp the reason why he had to pee and poo in toilet but it's just that he "dun want" or rather, is too used to doing it in his pampers. So alot of encouragements needed... like everytime he managed to pee/poo in the toilet, we'll praise him, sometimes i give him biscuits or sweets as a "reward"... as soon as he gets the idea that going to toilet is actually not a scary thing at all (lolz!) everything else is a breeze...