Uses cases give you information about both the structure
and the behavior of the system.
Use cases represent expectations of the system from a user
perspective. Use cases show specific actions and capabilities performed
by the system. These actions and capabilities produce a result which
is of value to one or more actors (external objects that interact
with the system) or stakeholders of the system. Your sample project
contains one use case diagram depicting the primary uses of the vehicle
sensor system. You can see how each of these use cases link to the
requirements that you worked with in lesson 1.
The Analysis package
contains a use case diagram and two primary use cases, as shown here: