Menus can also be put aside until the user wants to employ them. Figure 14.11
shows how a pull-down menu is used while constructing a PERT diagram for a
systems analysis project being completed for the Bakerloo Brothers. The user puts
the pointer on Dates and pulls it down. Then the user puts the pointer on
Calendar, selecting the option to display the project on a conventional monthly
calendar.
Menus can be nested within one another to lead a user through options in a
program. Nested menus allow the screen to appear less cluttered, which is consistent
with good design. They also allow users to avoid seeing menu options in
which they have no interest. Nested menus can also move users quickly through
the program.