Google Tech Talk: Human-Computer Interaction meets Economics: How to Measure Interface Utility with Mechanical Turkers.
This was interesting - an approach to measuring the quality of your user interface by how much you have to pay Mechanical Turkers to accomplish tasks with them (expressed as amount of actual work accomplished at a given wage). Seems like a very worthwhile thing to do with proposed UI changes before you roll them out to production, and I will definitely keep this option in mind when I am considering different UIs for my current project.
Some of the audio quality is a little dicey, so I switched on Google's automatic transcription, which feels like it's made some progress since I looked at it last. It's often surprisingly smart, but the error rate is still high.
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