In order to avoid unnecessarily complicated operations, a design that divides certain functions into independently operating sections is a must. Functions are categorized by importance and frequency of use; priority functions are assigned to the top portion of the camera, and lesser ones to the back. In some models, operational buttons used less often or those that should be protected from accidental use are located inside the palm wing. This helps prevent unintentional alteration of settings, and makes for a neater look by eliminating outside buttons.