Difference: 'uses', 'extends', 'includes'

Answer Posted / satish

Uses : When you are using the functionality for any actor
i.e. nothing but the use case

extend: When use case is alloted to the actor as per client
requirement then programmer will extend the functionality
as per the program needs.

includes : It is same as extends, here to fulfill the
requirement of client, uses cases of actor has been
designed but for program working it is necessary to extend
or includes the functionality
For ex:
Suppose teacher is assigning and viewing grades of
students. As programmer point of view for viewing grade it
is neccessary to save (extending functionality) to view.

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