my parents spanked (we call it smacking in AUS) me and my brother and sister while we were younger and it taught us a lesson. i was brought up that if i did something bad their would be a consequence depending on what it was i did. my parents would just smack our bottom with a wooden spoon. you shouldnt use your hand because the child will get confused, they will think the hand is hurting them but hands are what love them and give them hugs. i dont beleive in hitting children but smacking on the bum is okay as long as it dosnt bruise and believe me, you can get a good whack without it bruising

. it also depends on the time and place because if your out at night and the child would usualy go to bed at that time then they might get a bit cranky and so i dont think you should smack them in a situation like that. sorry for rambleing but thats just my opinion and others will have different ones
hope i helped
Random Chick