Interface design is often one of the most challenging aspects of game development. There is a lot of information to convey to the player and little screen space with which to do it. When the interface is poorly designed, a good game concept can be reduced to a frustrating user experience.
There are several theories that can be used by designers to analyse a user interface and help them break down choices. The theory we will look at here is called diegesis theory. It is adapted from diegesis theory used in literature, film and theatre. Diegesis refers to the world in which the story is set, and hence it focuses on games as stories.