Use Case Diagram for Car Rental System

The use case diagram for online car rental system is used to show the processes involved when users invoke the software. It depicts the structure of the system behavior.

Additionally, the diagram consists of processes (use cases) and users or “actors”. It uses defined symbols to describe the overall flow of the system.

Project Overview

Name:Car Rental System Use Case Diagram in UML
Abstract:The car rental system use case diagram defines the context and requirements of the entire software. It is shown using symbols to emphasize the project’s definition.
UML Diagram:Use Case Diagram
Users:Car Owners or Rental App Admin and Clients.
Tools Used:Any Diagram tools that provide use case diagram symbols.
Use Case Diagram for Car Rental System: Overview

What is a Use Case Diagram?

The use case diagram shows the sample behavior of the car rental system. It includes the project functions using use cases, actors, and their connections.

Moreover, the diagram assists you to define and organize project needs. This also provides a clear picture of the user and system relationships. Therefore, this diagram depicts the complex functions of a system including how the user reacts to it.

What is the Importance of UML Use Case Diagram?

Helping the developers and businesses with system management is one of the importance of the UML use case diagram. It includes the procedures from the viewpoint of users.

Car Rental Use Case Diagram

The designed car rental system use case diagram has two main illustrations. These illustrations describe the system’s general processes and specific processes using include and extend.

Car Rental System General Use Case Diagram

The general use case diagram for car rental system shows the general functions that the system could do. It is based on the transactions needed in rental management.

Car Rental System General Use Case Diagram

The general use case is the most common application of a use case diagram. The use case diagrams depict the system’s main components as well as the flow of information between them.

Use Case Diagram for Car Rental using Include and Extend

The use case diagram using include and extend is used to elaborate the proceeding diagrams. The terms include and extend in the use case diagram are known as indicators.

The label include is used to indicate that the sub-processes of the main processes must be included to complete the task. The Extend, on the other hand, declares that the sub-processes can only be performed when needed.

Manage Customers’ Information and Status Use Case Diagram

The system admin should manage the customers’ rental information to track their cars and services availed. This will serve as the basis for the management, to sum up, their income and expenses.

Manage Customers’ Information and Status Use Case Diagram

Manage Car Information and Status Use Case Diagram

This is where the admin of the system could manage and monitor their car information and services. In this process, they were able to assign the drivers and prizes of the service that are offered for rentals.

Manage Car Information and Status Use Case Diagram

Manage Rentals Info and Prizes Use Case Diagram

This is the process where the admin will have to manage every transaction done by the customers in the system.

The admin can monitor their customers as well as the services availed, they can also be able to check their revenues and prepare in advance for new accommodations through this management.

Manage Rentals Info and Prizes Use Case Diagram

You can add more to this illustration and it is up to you how will you create your diagram. But make sure to have precise information and consider the included use cases.

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How to draw a Use Case Diagram?

Time needed: 2 minutes.

Here’s the complete guide on how to draw a use case diagram for car rental.

  • Step 1: Familiarize Use Case Diagram Symbols

    For beginners in the field of designing the diagram, you need first to familiarize the symbols to be used.

  • Step 2: Determine the targeted users

    The next step is to determine your targeted users. They will be the ones to use your project.

    You may ask the users about the typical activities done in car rental.

  • Step 3: Analyze the use cases included

    The gathered information from the users needs to be evaluated to know the general use cases.

    From the general use cases, you will see the sub-cases that are included. But, only the useful processes and circumstances related to the car rental system.

  • Step 4: Plot the Use Case Diagram

    To plot the diagram you will need the users, use cases, container (scope), and their indicators (association). You will base the flow of use cases on the evaluated information from the users.

    You need to place first the users involved.

    Then place the figured use cases included in doing the process.

    After that, you will trace the association of the use cases to know the interactions between the user/s and the system.

    Finally, put the container in the plotted diagram to separate the objects’ (users and system) scope.


One of the methods that contribute to the car rental system development is the UML use case diagram. It helps developers know the possible inputs that the project should process and perform.

Furthermore, you will find out the needed processes and connect them to the other UML Diagrams. The diagram is also applicable in modeling the software’s use cases (processes). It also captures the system’s flow from one process to the next.


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