Structure charts can map the structure and data flow of complicated tasks
A Structure Chart in software engineering is a chart which shows the breakdown of a system to its lowest manageable parts. They are used in structured programming to arrange program modules into a tree. Each module is represented by a box, which contains the module's name. The tree structure visualizes the relationships between modules, showing data transfer between modules using arrows. Structured Charts are an example of a top-down design where a problem (the program) is broken into its components. The tree shows the relationship between modules, showing data transfer between the models.
Symbol
Name
Meaning
Module Name
Process
Each Box represents a programming module, this might be something that calculates the average of some figures, or prints out some pay slips
Data Couple
Data being passed from module to module that needs to be processed.
Flag
[Extension - you don't need to know this for the exam] Check data sent to process to stop or start processes. For example when the End of a File that is being read is reached, or a flag to say whether data sent was in the correct format
Structure Chart representation of the selection code
A selection in a Structure Chart is determined by the diamond symbol. This means a condition will be checked and depending on the result, different modules will be executed.