Focus on the Job, Not the Customer. A different way to look at your app
blog.intercom.io
blog.intercom.io
http://jnd.org/dn.mss/human-centered_design_considered_harmf... and here:
http://www.jnd.org/dn.mss/hcd_harmful_a_clari.html
Highly recommended reading. I feel like it's a good sign that the community keeps re-inventing this. It means that it has some real legs. Another great example of our best practices slowly strangling good process.
And as subtle as it seems, I think there's a difference between "why do people use your product?" and "why do people hire your product?". "Hiring" seems to imply selection from multiple candidates, payment for (and an ongoing involvement with) the product etc.