Lab report on Use Case Diagram

TITLE: -          USECASE DIAGRAM

THEORY:

USECASE DIAGRAM:

A use case diagram is a representation of a user’s interaction with the system that shows the relationship between the user and the different use cases in which the user is involved. It is a type of behavioral diagram. They are used to model the system by including all the activities within a rectangle and focus on the actors outside the system by interacting with it.  

Use case models consist of the following components:

·         Use case

·         Actor

·         Relationships like dependency, generalization and association

·         Scenario

·         System Boundary

·         Use Case description

a) Use case

A Use Case is an interaction between the system and a person or another system to achieve a result. It describes the sequence of actions which a system performs yielding visible results. It can be applied to the whole system as well as a part of the system.

b) Actor

An actor represents the roles of the users in use cases. It can be a person, a device or any system.

Examples: student, customer, bank, institution.

c) Relationships

It indicates the semantic connection among elements, relationship between actors and use cases. Relationships in use case are include and extend.

Include relationship occurs when you have a chunk of behavior that is similar across more than one use case. It is indicated as <<include>>.

Extend relationship where you have one use case which adds functionality to another use case. It is indicated as <<extend>>.

d) Scenario

It is a single path through use case. Usually , use case is a collection of scenario.

e) System Boundary

It is the high level indication of the domain

 

USECASE DIAGRAM

Scenario –I

An Automated Teller Machine (ATM)

Figure: Use Case Diagram for ATM

 

 

Scenario-II

Hospital Management System

 

Figure: Use Case Diagram for Hospital Management System

 

 

 

Scenario-III

Restaurant Management System

 

Figure: Use Case Diagram for Restaurant Management System

 

 

 

Here, use case diagram of Restaurant Management System consist of four actors and five use cases and a system boundary. The three actors are named as Customer, Cashier, Chef and Waiter. Here Customer place the order and waiter receives order which is confirmed by the chef to ready the order and cook the food, which is served by waiter to the customer and customer eats the food and pay the bills and cashier accept the payment.

 

 

 

Discussion and Conclusion

               From this lab session we got familiarized with the use case diagram, it represents the user’s interaction with the system .It also shows the relationship between the user and the different use cases in which the user is involved.

Hence, from this lab session we have understood basic knowledge about use case diagram.