Increasing desirability, feasibility, and viability is an iterative process.
Here are my examples of user centered design research I have been involved with.
(Examples of the artifacts and deliverables created from my application and website design work can be seen in my UX Portfolio.)
Using robots to navigate through the body allows for smaller less conspicuous incisions and quicker recovery for the patient. However, the surgeon can become confused when the location and orientation changes as the robot moves through the body. To use an analogy, I was helping the surgeon feel like they were behind the wheel of the car instead of controlling a remote control toy.
Mobile Phones are one of the first pieces of technology adapted by remote villages in the middle of the jungle or desert and one of the last pieces of technology given up by people who have lost everything including somewhere to live. This research looked at how the fringes of population used mobile technology
Ten percent of the population has some kind of disability affecting their use of technology. This is too big of a sub-population to ignore since, as medical advances increase, people living longer will only make this number larger. This research concentrates on making technology more accessible for varying disabilities simultaneously.