Structure Chart

Structure charts:

      *   a top-down representation of business functions and processes. Also called a functional
           decomposition diagram.

      *   show the program modules and the relationships among them

    Control module:

           *  In a structure chart, a control module is a higher-level module that directs lower-level                          modules, called subordinate modules.

   Subordinate modules:

           *  A lower-level module in a structure chart

   Module

           library module - In a structure chart, a library module is a module that is reusable and can be
                                      invoked from more than one point in the chart.

           Data Couple - shows data that one module passes to another.

           Control Couple - shows a message, also called a flag, which one module sends to another.
                                       Flag - is a message sent from one module to another. A module uses a flag to                                                  signal a specific condition or action to another module