"Design philosophy" refers to the guiding principles or beliefs that influence how objects, systems, or graphics are created. It involves the specific ideas, values, and aesthetics that designers follow in their work. Full definition
The same design philosophy of modern meets retro continues on the inside. (cardekho.com)
● Android settles on a new design philosophy with «Material design» and publishes these design guidelines for others to follow. (tomsguide.com)
One of the ways that my general game design philosophy is different from other people's is that I am very much centered on «the player, their experience and their decisions». (keithburgun.net)