Originally Posted by tomaspet262
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.
There's certainly plenty of scientific method, in the sense of encouraging the creation of hypotheses, experimentation (30 day trials), careful observation of the results (journaling and goal tracking) and writing up the observations.
If you mean that the book doesn't cite neuroscience or psychology papers, then that's true. (I'm not sure that it would necessarily have been improved or made more useful by referring to such research, but that may be a separate question.)