[nickpinkston]

Based on going through nearly the entire Khan math test graph, I can say that the thing that was great was the instant feedback that the problems give you.

For those not familiar, you need to get many questions right in a row to move. These problems are generated along with "hints" specifically tailored to the problem - as-in the problem is worked step-by-step for you as you click "hint". What was also great is that it adapts (it seemed at least) to give you problems like the those you're having trouble on.

All of this gives you the feeling: "I'm really getting this, I'm not so bad at math after all" - all intrinsic. I looked at the badges as just "neat" - but the big chart of activity was somewhat inspiring because you can see yourself persevering. Then again - this is also intrinsic.

[Lewisham]

I certainly do need to interact with Khan Academy more often, I need to brush up on my probabilities for technical interviews this summer, so I'll use that as a step into the product.

FWIW, having seen Salman Khan speak, it's hard not to be swept up with his cause. He's a man on a mission, and if anyone has the vision and charisma to pull off Khan Academy's goals, it's him.

[aik]

I think an important distinction is also that the purpose of the math test graph is to specifically quantify prior learning (ie. it provides a reasonably realistic measurement of learning) -- this is not gamification necessarily. The badges are gamification. Our goal should be realistic and effective quantification of learning/improvement (passive feedback that generally increases intrinsic motivation), rather than implementing external motivators or artificial targets (which badges typically are).