In the block definition diagram, a Context block establishes a context for the model. The context is composed of the two systems blocks; a constraintBlock, Heat Energy Equation is used to represent the physical relationship between heat and temperature change. Each of the blocks shown on the diagram is characterized by a set of attributes, but the constraintBlock is defined by a set of constraints.
An internal block diagram, that is attached to the Context block, shows the connections between its components. This is the diagram that you completed in Lesson 4. A parametric diagram is used to show the application of the constraint represented by the Heat Energy Equation to the SystemUnderControl block, that is, to connect (or bind) the parameters of the constraints to specific attributes of the components. Since you added a mass attribute to the SystemUnderControl in Lesson 3, you can now modify the parametric diagram to include a binding to that attribute.

To add the mass attribute to the parametric diagram:

