In UML modeling, you can
specify the services that a component needs to perform its functions
and to fulfill its own obligations to its clients.
Before you begin
A diagram must be open in the diagram
editor and it must contain at least one component and one interface.
About this task
To specify a required interface, in the diagram editor, click
an interface and drag it over the Required Interfaces compartment
of the component.
Results
If the component is showing the external view, the required
interface is displayed as a socket attached to the component shape.
If the component is showing the internal or class view, the interface
is displayed in the Required Interfaces compartment.