I'm not a parent (yet) but I suppose I could put in my uneducated opinion. I'm not against spanking although it needs to be used wisely. IMO, it should not be the very first immediate action where disciplining is called for. When it is administered, I agree that certain rules are laid down. I've seen a fellow church member discipline his 6-7 year old kids. He tells them the reason why he spanks them. It is usually a reason that demonstrates the parents' love for them.
E.g. Do not wander off on your own because there are some ppl out there who will take you away ("kidnap"). Daddy and Mummy don't want that to happen to you. So we have to punish you if you disobey."
He goes off to further explain where he'll administer the punishment (i.e. hand, butt, cheek) and he'll even say how hard he'll do it (I.e. hard enough until you'll cry).
Heh, it may seem scary to a kid but hey, I think he made his rules and reasons pretty clear.
Spanking also only works to a certain extent such as age, and balancing between positive and negative reinforcement seems like a good idea to me.
Y'know, I turn out a pretty decent kid without any spanking. OK, I'll admit that there was only one time my mum chased me with the discipline rod. I skipped classes and played with my friends instead. Hehehehe I was super freaked and never did that again. XD;;;
Oh and do the Japanese do it? From a limited experience of working at this particular kids program in Japan, kids were allow to run around freely and madly. They screamed, they jumped around, they pummeled adults, they tumbled around. 0_0;; I wondered how mums disciplined their kids (dad is usually absent with these kids) and according to my friends, they say the mums don't discipline
too much at this age. *shrug* I don't know, that's what I've heard.
Do note that my experiences are limited to some parts of Asia. I don't know how it's done in other regions but SuperNanny is enough to convince me that some kids need discipline.