It's amazing what a kid (or anyone really) can accomplish when THEY HAVE TO, OR ELSE!!! The key question, though, is: Are you, the responsible adult, going to retain your own sanity until the end of the process? The recalcitrant one can summon an impressive array of stalling tactics:
"Oh sorry Mum, I didn't hear you calling. What was it you wanted me to do, again? But I can't, right now! Just let me battle the final boss, it's only going to take a minute!"
Twenty-five minutes later: "Okay, I'll save and quit, Mum. But I've got some maths homework to do. It's only one chapter, I'll do that first."
Fifteen minutes later: "No, I couldn't start my maths homework. I couldn't find a pencil."
Half an hour later: "Mum, how come you're not telling [sibling] to clean his room?"
Then there's the "I'll do the job so badly that she'll never dare ask me to do it again" tactic, the "Didn't you say you were going to give me pocket money for this?" tactic, the "I have suddenly become deaf and have also acquired a terrible case of executive dysfunction" tactic, and the ever-popular "I'll wait until just before bedtime and announce that I'm ready to do it then" tactic.
Sometimes the kid actually will make a half-decent effort (after all, he's seen you do it hundreds of times), and you have to suppress your OCD-driven urge to do it all over again because he hasn't done it the way you would have done it.
What ages are your kids, Chris McC?