Online Shopping use cases example:
Web Customer actor uses some web site to make purchases online. Top level use cases are View Items, Make Purchase and Client Register. View Items use case could be used by customer as top level use case if customer only wants to find and see some products. This use case could also be used as a part of Make Purchase use case.
See the use case diagram in the provided link.
yes
Use case UML diagrams depict functionality (use cases) offered by a system (subject) from a point of view of external user (actor), what designed or existing system can or is supposed to do for external users of the system.See examples of use case diagrams in the related link.
Online Shopping use cases example: Web Customer actor uses some web site to make purchases online. Top level use cases are View Items, Make Purchase and Client Register. View Items use case could be used by customer as top level use case if customer only wants to find and see some products. This use case could also be used as a part of Make Purchase use case. See the use case diagram in the provided link.
can u prepare the use case diagram for simple payroll system?
That's how we organize our shopping
You can find several examples of UML diagrams - use cases, components, activities, communication, deployment - for e-shopping in the provided link.
A use case diagram shows the relationship between actors in a system and the use cases. An actor is a role, not a specific user; for example, Bill, Fred, and Jane may all be specific user's of an ATM but they all play the same role of a customer. A use case is functionality (a dialog) that an actor can have with the system.Use case diagrams are one of the UML diagrams used during the requirements analysis phase of a system. Use case diagrams are primarily used for the development of software systems, but as they can also be used to associate actors with manual processes outside of software systems.See the links below for a 4-part tutorial on use cases and use case diagrams.
dena uttar salya
Use Case diagrams are behavior diagrams of UML used to describe a set of actions (Use Cases) that some system or systems (Subject) should or can perform in collaboration with one or more external users of the system (Actors).Each use case should provide some observable and valuable result to the actors or other stakeholders of the system.Use case diagrams are a means for specifying:(external) requirements on a system under design, required usages of a system - to capture what a system is supposed to do;the functionality offered by existing system -- what system can do for clients;requirements the specified system poses on its environment - by defining how environment should interact with the system so that it will be able to perform its services.
Use case diagrams are used foe better understanding of software. They have actors , use cases and relation between them.
I am guessing that you can only use it while online shopping...
This is a online shopping site. They use paypal for transactions.