11.   The information content of maps is also an issue for user interfaces.

12.   The operating system of choice will depend to some extent on which transport highway consumers ride and the user interface they prefer.

13.   At a design level, the user interface determines the screen design and its functionality.

14.   This brief discussion of user interfaces merely touches on their significance.

15.   We have already addressed this idea to some extent in our discussion of user interfaces.

16.   Is the user interface simple, understandable, consistent?

17.   Instead, it deals only with a set of internal user interfaces, which sends both requests and data carrying a known identification to authorise the transactions.

18.   This reduces the number of errors from mistyping, speeds up the operation of the user interface and provides a session memory.

19.   The following error messages are those that may occur when using the LIFESPAN user interface.