Science behind Personal developement for Smart People

[tomaspet262]

I am interested in self-developement stuff and I think that it's important to care about personality. But what is interesting about self-help books is that at most, there are opinions and techniques that "just work".

Advantages of this approach are obvious, but on the other hand, it lacks holistic perspective. No one will point on one book and say "Hey, this is all you need to know about self-development" - philosophically speaking.

There are no common teories and experiments behind self-developement. What I mean is that this area lacks of science. I am not hard-core scientist and I don't post this thread to just prove my point. I just want to know just your opinion about this question. I will put this philosophical question in the concrete:

Why isn't there any science behind book Personal developement for Smart people ?

This question is mainly for Steve, but If someone think that he has appropiate answer, feel free to post.

Thanks.