I have the PD book for 1-3 year olds and have used it often, now this one is helping again with more common sense but well thought out approaches to understanding and living with toddlers and preschoolers.
There is no easy fix, 'supernanny style' answer (thank god as the naughty step is just so awful and pointless and I can't stand that it is the number one parenting tool at present). I see parents often who nag, hound, say the same futile thing over and over (last warning, I'm not saying this again, yelling from one end of the playground to the other, sternly telling off tiny kids) and I just don't want to do that myself. I can't bear the thought of 10 years of nagging, threatening and general unpleasantness. I haven't had brilliant parenting role models around me (although my parents did their best, there was a fair amount of wooden spoon, threatening, yelling and general unpleasantness involved).
I like that this book is NOT about permissiveness and letting your child do anything and everything. But it is about learning what they can learn and what they should learn at various ages, and there are just loads of tips about teaching your child so that they can do the best they are capable of. The main idea of it is that discipline is NOT punishment, but a process of learning and guidance. It is very hands on, but they are gentle hands. It is not easy because you have to be patient and think ahead about how to avoid problems, and what to do when they occur (ie not just going off on your own tantrum). But it is very worthwhile and helpful.