Take the leadership feat, and hope your GM is lazy enough to let you level them. More practically, is it a skills problem or as I would guess an agency problem? Can impress on them the importance of acting vs not? Lend them the Power of Accountability? 7 habits of highly effective people? Can you compliment them every time they show initiative? etc. I think the solution is too specific to individuals for general advice, nor do I know a general advice book beyond those in the same theme as those mentioned.
Heh.
More practically, is it a skills problem or as I would guess an agency problem?
Agency. I've just noticed how many people I interact with are operating almost totally on cached thoughts, and getting caught up in a lot of traps that they could avoid if they were in the correct frame of mind (ie One Of Us.) But you have to be ... motivated correctly, I guess, in order to turn to rationalism or some other brand of originality. Goes my reasoning.
...I think the solution is too specific to individuals for general advice, nor do I know a general advice book
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.