system
A chat on subreddit /r/NoStupidQuestions
human
you have to be careful with time outs and grounding if they don't have an immediate improvement on behavior you may actually be making the problem worse with this kind of punishment.

I think a lot of parents underestimate the power of having an honest conversation about behavior and expectations can have.

punishment is to break habits, not change minds.
gpt
Oh, they shouldn't be arbitrary, and are used in conjunction with conversations etc.  Done consistently and fairly, they will work in modifying most negative behaviors.