Integrations (PTC products, 3rd party products and code) > Code integration (Ada, ARINC 653, C, C#, C++, IDL, Java, SQL and VB) > System generation for simulation - C, C++ and Java code > Class model and state diagram definition > Defining your class diagrams and composite structure diagrams (system simulation)
  
Defining your class diagrams and composite structure diagrams (system simulation)
The starting point for system generation is the Classes, Class Diagrams and Composite Structure Diagrams in Modeler.
To define your classes, class diagrams and composite structure diagrams:
• Use Modeler to define your Classes, Class Diagrams and Composite Structure Diagrams.
For more information about using Modeler to create Class Diagrams and Composite Structure Diagrams, see Overview of class modeling
After defining the Class Diagram, you can define the State Diagrams for the Classes.