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Question 780:

Dear Mr. Sauro:
In reference to you article, "Calculating a Sigma Level from Task Success," I found no references to “usability” nor “task completion” in an book on six sigma, nor on the Internet.
1. What books and magazine articles can you recommend where I will find more information on this?
2. What sort of tasks are you referring to?
3. If the task is data entry, which is measured by keystrokes per minute, what sort of confidence level is used with this?
4. How is the confidence level a function of the number of tasks completed during what time period (houly daily, weekly, etc)?

Thank you.

Sincerely,

Chris Kaufmann

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