I'm glad you like 'sets' Mary - it certainly makes sense to me, but it is a little abstract, in the sense that Facebook is moree inclined to talk about adding a friend rather than adding someone to your network.  I guess the sensible thing to do will be to try it and see what happens!

 I like your thoughts on chaos and agree that one of the great benefits of a system like this is connection of disparate ideas and serendipitous encounters, but in order to achieve that there's a pragmatic obstacle to be overcome that you need to be able to find what you need/want (which may not be what you are actually looking for) in the first place. That implies a little structure for the most part, but not necessarily the traditional top down tree structures and teacher-guided paths, though that should be an option if it is what people want too. One of the things we have waiting in the wings, for instance, is a collaborative filtering widget that provides recommendations of where to go next: bottom-up, ever-changing, but definitely structure of a sort. It's about control. Sometimes chaos is ideal, sometimes it can get in the way of learning, it varies from one person and one context to the next, so we need to find ways of controlling the chaos.

Jon

I agree, Jon.  It's a very fine balance between chaos that allows for creativity and growth and chaos that overwhelms a learner.  I'm wondering if there is a connection between learning preferences or personalities and tolerance for chaos in learning.  I've certainly seen both extremes in students I've had over the years.  This could have implications for teaching/learning strategies online and in MOOC settings.

While focused on creativity, I found Rietzschel, Dreu and Njstad's article [1] on personal need for structure and creative performance interesting and it suggests to me individual tolerances for chaos and structure.

I believe it would be interesting to store individual tolerances and motivations so content delivery can adapt to the current state in the individuals profile. This way a group is not attempting to control chaos, but rather chaos is adapted to individuals needs.

@Jon, is structure always about control? I would have described this as order/chaos and see equating control to order as a cultural bias.

[1] Personal Need for Structure and Creative Performance: The Moderating Influence of Fear of Invalidity, Eric F. Rietzschel, Carsten K. W. De Dreu and Bernard A. Nijstad, Pers Soc Psychol Bull 2007; 33; 855 originally published online May 3, 2007;
DOI: 10.1177/0146167207301017

Thanks, Jon. I can use this

APPLE does provide a free open-source version - Darwin - of it commercial XNU/unix version.  Thus free and non-restrictive:

http://opensource.apple.com

Just need to do a few geek manipulaions to run Darwin on a PC Intel :
http://www.makeuseof.com/tag/how-to-install-mac-os-x-on-a-pc-without-using-a-mac

Virtual:
http://www.puredarwin.org
http://www.ihackintosh.com/2012/07/install-mountain-lion-in-vmware
http://www.sysprobs.com/easily-run-mac-os-x-10-8-mountain-lion-retail-on-pc-with-vmware-image
http://understandingexistence.net/2012/08/06/running-mac-os-x-lion-10-7-4-in-a-vm-virtual-machine

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