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Great article. I've used variable rewards in the past by flipping two coins every time I logged an additional hour of work on high priority goals/projects. Whenever the coins landed as 2 heads, I would earn an energy drink (I crave those things, but usually don't drink them). The system worked very well, to the point where I include some level of variable rewards in all major goals/projects I undertake.
11 months ago on Using Variable Rewards to Drive Behavior Change