Jon Plummer

At work we’ve recently begun some serious (read: crash program-style fast and furious) work on an embedded software interface for a small handheld device. […] A top use case, for us, is one that is crucial to a person’s adoption of the device, day-to-day use of the device, or is bound up with a safety or security concern. […] With an existing product or launched site or service you can learn where the problems are from a variety of sources […] For a new product, ideally you have a solid sense of what the top use cases should be, if the product is at all well-defined.