Classification and simplification make data easier to understand. The selection and design of these symbols greatly effects the communicability of the map. Cannot determine quantity. Ex. locations of different types of recreational areas in AZ or rest stops along I-8. Map scale has tremendous consequences on map design scale, symbolization, and map projection are all inter-connected.
Scale varies over the map depending on the map projection used.
Information needs to be selected to suit the particular purpose of the map Generalizing operations - each results in reduction of the amount of specific detail on the map, bit end result must present the map reader with enough info. To grasp conceptual meaning of the map. Generalization leads to simple visual images. Map reader more likely to retain the information if simple. Selection Geographic space to map, scale, projection, aspect, data variables to be used.