Archive for September 10, 2014

No Such Thing as a Random Sample of Five People

Written by Sean Murphy. Posted in Customer Development, skmurphy

Q: I have 3D printed a couple prototypes of my product. I am going to get user feedback by letting security guards–my target market–test if for free for a few days. How many prospect should I have test it before I can determine if there is a market for the product.

Since you are 3D printing and can iterate I would start by getting feedback from five folks: see Why You Only Need to Test with 5 Users by Don Norman for some research on why this is a reasonable place to start.

You will more than likely end up talking to more folks before deciding if there is a market or not but working with a small group at one time and testing iteratively will be easier to manage and teach you things more rapidly.

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