Designers think by doing - prototyping
"Designers are action-oriented. Today’s world of academia produces deep, thoughtful thinkers. Today’s world of design produces deep, thoughtful doers. We need both thinkers and doers, but just as we must take both paths from the fork, designers do both doing and thinking: the design philosophy is to think by doing. Designers do their research by designing. Instead of long periods of deep analysis, thought and planning, designers move rapidly to experimentation, to construction of artifacts or new procedures which they use to probe the world relevant to the issue at hand, using the responses as evidence on how to proceed. Instead of deep, abstract thought, it is deep embodied thought, embodied in action, in physical structure, and informed not by abstract principles but by the real evidence of the responses to the probe."
--last paragraph of larger and interesting piece published on Linkedin