Lieb talks about why most company’s struggle with designing simple products and makes two suggestions that I loved on how to know if you’ve succeeded:
1) Test it out on the young, old … and the drunk (not kidding)
2) Ask your users/customers to repeat what your product does and how it works.
His first point is funny – but you can see why it would be effective when you really think about it. But the second point is what really resonated with me. Let people use your product and then ask them to tell you what it is. This could go a long way in really nailing your value prop.
Here’s a link to the full post: http://techcrunch.com/2013/04/20/cognitive-overhead/