The rule of thumb in many usability-aware organizations is that the cost-benefit ratio for usability is $1:$10-$100. Once a system is in development, correcting a problem costs 10 times as much as fixing the same problem in design. If the system has been released, it costs 100 times as much relative to fixing in design.
Watch this video and use the ROI Calculator below:
ROI CALCULATOR:
https://docs.google.com/spreadsheet/ccc?key=0AgRqKb-03HvTdHU5dWFlSHVGbEwwSHdNS3hqeS1NV2c#gid=10
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