Lucy - posted on 07/01/2011 ( 38 moms have responded )
That is the question that child psychologist John Rosemond answers so well in his book of the same title.
Here is a link to a one page summary of what he says in the book.
If you like Rosemond and his lots of love, no-nonsense style of parenting, you'll like this. If you are the person who is convinced that no form of physical contact is appropriate to discipline then you probably won't agree with Rosemond or anyone.