A control must not violate de facto standards or unwritten rules. Controls must not require more strength, coordination, or other physical attributes than the expected user population can supply. Controls must not be error provocative. The best controls are designed to be intuitive, both in what they control and how they function. These principles are carried out through mapping, affordances, and coding, among other things.
Mapping is what enables a specific control to be located by the user.
Natural mapping permits the user to instantly recognize a control's function and to easily locate a specific control. It is shaped just like the seat and is placed on the car door. If you want the seat to move a certain way, just push on the control like you want the seat to move. This is excellent use of natural mapping. Another example of good mapping is to place controls on a representational layout of the process.