Design thinking
Desirable, viable, feasible
Three factors shape every product. It is desirable: people want it. It is viable: it makes sense for the business, so it can sustain itself. And it is feasible: it can be built within the expertise, timeline and budget you have.
Design sits where the three overlap. The job is to help you figure out what the product is, or how it can be improved, with all three in mind.
Popularized by David Kelley and Tim Brown of IDEO