In the Lean Start Up Eric Ries asserts that start ups should be testing their idea or product with potential customers in the form of a MvP (Minimum Viable Product). I say go a step further, think even even leaner. Construct and test a ‘MvX’ (Minimum Viable Experience) with users, and gather feedback on whether the experience is usable, exciting, and percieved of as valuable. A MvX will also allow you to iterate the product quicker and more efficiently, before development costs are incurred. Above are examples of paper prototype testing stimuli that could be used as a Minimum Viable Experiences.