These are the arguments laid out to convince you to follow their method. Below I will describe the method they provide for kids 6 months and older. They do also have a chapter for younger kids, but I skipped it since it was irrelevant to me.
This is the first portion. Next things can go 2 ways. Your baby sleeps (great!) or your baby screams. If the former, nothing for you to do, just enjoy life. If the latter, here is what you do:
That’s it. With this method, your baby will be a pro sleeper in no time. There are some psychological difficulties for parents to let their baby cry. Authors cover this too. However, these arguments didn’t really help my wife. In the “My Thoughts” section I will share what helped her. But here is what the authors have to say about this:
This book is great. In reality, this could be described in a blog post or even a tweet, but that doesn’t matter. If you have a baby that is at least 4 months old, you should give it a read. I read it in 4-5 days, even though I’m generally a slow reader.