If you have a chance, read it.

And on understanding the causes of procrastination, rather than an action-based plan.

I'm not so sure.  I tend to view "understanding" as a whole-life psychological endeavor, that something like therapy is very useful for, to allow more freedom from childhood scripts, and mis-understandings held in the mind, and of course for simple allowing/healing.

That is very useful, but I think action-based plans - with of course right attitudes, which this approach strengthens - is more useful.