I'd like to add that the OpenHatch folks are doing a fantastic job of pushing across 'bite-sized' tasks which can help someone who has joined new to any project to gather skills and build credibility.
Firstly, thanks for another lucid article. I find it somewhat interesting to note that at any point in time a diagram representing the communities would eventually and invariably end up as layers/concentric circles without showing any interconnections.
And, in some way the image emphasizes the perception that communities are groups of folks at various proximities instead of being enmeshed together in a very collaborative give-n-take. More a neural network than an onion :)
I'd like to add that the OpenHatch folks are doing a fantastic job of pushing across 'bite-sized' tasks which can help someone who has joined new to any project to gather skills and build credibility.
http://openhatch.org/