I often think about that. It is why I wrote many thoughts about "Maturity Models": the best ideas for any subject (the system being far from ... uh, mature, at this point). But the idea is to take best practices and collate and order them with dependencies, instead of reading thousands of books to know what is "next" for one's own growth in an given subject. The idea is that multiple optionally-integrated-if-and-when-they-want communities of practice could develop. More info buried at at http://lukecall.net under Lessons Learned etc etc.

Edit: url & minor fixes. Also I hope to eventually progress with this, using my http://onemodel.org project.

Edit: ideally anything (or any source of info) could be assigned transitive trust levels. Dietary science would get a low one in my system at this time. ;) Physics, math, and epidemiology would probably get much higher ones.