Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A Structure Chart (SC) in software engineering and organizational theory is a chart, which shows the breakdown of the configuration system to the lowest manageable levels. It is used to show the hierarchical arrangement of the modules in a structured program. Each rectangular box represents a module. The names of the modules are written inside the box. An arrow joins two modules that have an invocation relationship.