A decomposition structure diagram shows a complex process, organization, data subject area, or another type of abject broken down into lower level, more detailed components. For example, decomposition structure diagrams may represent the organizational structure or functional decomposition into processes. As the image suggests, decomposition structure diagrams can be broken down into sub-functions. For instance, a log-in function may be broken down into sub-functions called to get a user ID, get a User password, validate user password, check user permissions, display user home screen, display error screens, etc. Use EdrawMax or EdrawMax Online’s predefined templates to create highly customizable decomposition structure diagrams for your project.