Sequence Diagram for Online Shopping Cart

Sequence Diagram for Online Shopping Cart

The sequence diagram for online shopping cart describes the series of interactions that occur with the objects when performing the process on the system. It is one of the UML models used for presenting the workflow, sequence of messages, and interactions within the Online Shopping Cart.

Online Shopping Cart Sequence Diagram: Project Details

The table shows the details of the sequence diagram for online shopping cart. It has the complete component of the project.

Name:Online Shopping Cart Sequence Diagram
Abstract:The sequence diagram for online shopping cart represents the scenario and the messages that must be passed between objects. It’s an interaction diagram that shows how activities are carried out, including when and how messages are sent.
UML Diagram:Sequence Diagram
Users:Online Seller, Admin, and Online Sellers.
Tools Used:Diagram tools that provide sequence diagram symbols.
Online Shopping Cart Sequence Diagram – Project Details

What is Online Shopping Cart?

Shopping cart software is part or equal to an e-commerce software that runs on a web server and allows visitors to an Internet site to choose things for purchase. Customers who shop online can create a wish list of products to buy using the software. Its goal is to aid online merchants with big client records by providing at least a simplified self-service option.

The entire purchasing process is automated with a shopping cart system. This statement explains that there is less work for online sellers and a simple transaction for online customers using a shopping cart. Sellers can save time, and money, and keep the customers happy by delegating the task to the shopping cart.

What is UML Sequence Diagram?

In software engineering, the UML sequence diagram depicts object interactions in a sequence of events. This diagram shows the online shopping scenarios and how they communicate with each other to function correctly.

According to, a UML sequence diagram helps software engineers and business experts figure out what the project should perform and how to describe a process that is already in place. It’s a form of interaction diagram since it shows how a group of things interacts and in what sequence.

A sequence diagram is a useful tool for documenting a system’s needs and fleshing out its architecture. Because it depicts the interaction logic between the items in the system in the time order in which they occur, the sequence diagram is quite valuable.

UML Online Shopping Cart Sequence Diagram Description

The sequence diagram is used to look at the behavior of multiple objects within the online shopping cart. Sequence diagrams are good for showing how objects work together and in what order the events occur. It shows objects that communicate within the online shopping cart, with messages going from them to each other down the process in a certain order.

The online shopping cart uses a sequence diagram to show how objects interact and how they happen sequentially. This sequence diagram shows how messages move from one object to another in a way that makes sense.

UML Sequence Diagram for Online Shopping Cart (Illustration)

The designed sequence diagram for the system’s online shopping cart gives you the exact scenario when the project is in use. This design presents the actual sequence of events and interactions between the online shopping cart. It uses symbols to represent the included objects and their roles in the shopping cart sequence diagram.

UML Sequence Diagram for Online Shopping Cart
UML Sequence Diagram for Online Shopping Cart

The illustration is based on the main process of online shopping cart. It can still be modified and added with your desired functions and scenario. It is more effective and efficient to manage and monitor the users’ activities using the log records in online shopping.

Online Shopping Cart Sequence Diagram (Explanation)

The explanation for the online shopping cart discusses how the illustration works. It has the figures which will clarify the sequence of activities and their alternatives. The box figures represent the object, the stick man is for the user, and the broken lines are for the lifelines. Vertical arrows then present messages.

The sequence diagram is designed to portray a timeline that starts at the top and gradually lowers to show the sequence of interactions. Each item has a column, and arrows indicate the messages that are sent between them.

The online shopping cart sequence diagram has several boxes (objects): the system user, online shopping cart, accounts database, and system interface. Its users could be personnel in an establishment and institutions, and the messages have a flow showing the alternative in every decision.

UML Sequence Diagram for Online Shopping Cart (Pdf)

You may download the Sequence Diagram for Online Shopping Cart PDF by clicking the button below. It has the full details and discussion of the system’s sequence diagram. You can also modify its content to complete your project requirements and needs.

Advantages of Sequence Diagram

The UML sequence diagrams are commonly used by developers to model the interactions between components in a single-use case. They show how the various components of a system interact to perform a function, as well as the order in which the interactions occur when a certain use case is executed. here are the advantages of designing a sequence diagram:

  • A sequence diagram depicts the timeline and order in which messages are sent between devices to carry out process functions. 
  • Sequence diagrams are based on objects rather than classes.
  • Used to step-by-step model a system’s process.
  • Sequence diagrams are a great way to model the dynamic properties of your system.
  • It aids programmers in determining the overall message flow between objects that perform use-case logic.

Steps in Developing Sequence Diagram

Time needed: 10 minutes

Here’s the complete guide and steps in developing and designing your sequence diagram for the Online Shopping Cart.

  • Finalize the purpose of the project

    The first step in doing your sequence diagram is to finalize what your project is all about. The long and registration sequence diagram portrays the scenario when a user registers and tries to access a certain system. Then this idea will give you other initiations on what to include in the project.

    Take note that you as the developer and your client (if there is one) can decide on what functions and features should be included in your project. It’ll include anything as long as the function or feature is related to the idea of your project.

  • Place your users or objects

    The project users in the sequence diagram will always be based on your targeted users. You can create a design for each of your users or put them all in one design. Just be mindful of having a clear and precise illustration.
    Sequence Diagram for Online Shopping Cart - Objects
    On the other hand, the object is represented by a rectangle with the object’s name underlined. The object name, the object name, and its class, or only the class name can all be used to name an object (anonymous object).

    The sequence diagram depicts a group of objects connected by lifelines as well as the messages they exchange overtime during the interaction.

  • Add the lifelines in each user and object

    A lifeline represents each instance of interaction. As it moves downhill, it represents the passage of time. Broken vertical lines show the next events that happen to an object during the charted process. A named rectangular shape (object) or an actor symbol is used to start Lifelines.
    Sequence Diagram for Online Shopping Cart - Lifelines
    The lifeline sequence diagram is symbolized by a broken line connected to its head (object) that represents the lifetime of the object.

  • Structure the sequence of messages (interaction)

    A message is a representation of communication between objects or between an object and its surroundings. An event, a triggered operation, or a primitive operation are all examples of messages. A message in the metamodel denotes a certain sort of communication.
    Sequence Diagram for Online Shopping Cart - Messages
    In UML diagrams, messages are represented as labeled arrows, with the arrowhead indicating the call’s direction. When a message is sent to an object, the name of the method being called on the receiving object is indicated in the text associated with the message.

    In a sequence diagram, a message is a named element that describes one sort of communication between interaction lifelines. The message not only describes the form of communication, but also the sender and receiver. Usually, two things happen the transmitter and the recipient (the points at the ends of messages).

  • Add alternatives (if needed)

    When a scenario needs to choose between two or more message sequences, the alternative combination fragment is employed. It represents the logic of “Otherwise, if. One way for distinguishing which fragment is which “operator for fragments” is to put “alt” in the name box of the frame, also known as the “frame name box.
    Sequence Diagram for Online Shopping Cart - Alternative
    Different process conditions are denoted by the term “alt. Only one of the options will be implemented. The term “opt” means a workflow phase that can be skipped.

  • Add the X symbol as the lifeline end

    When the object’s lifeline is completed, you can add an X to the end of it to indicate that it has been destroyed. A rectangle represents a recurrence or loop in a sequence diagram.
    Sequence Diagram for Online Shopping Cart - End

Additional Knowledge

A sequence diagram is a useful tool for documenting a system’s needs and fleshing out its architecture. Because it depicts the interaction logic between the items in the system in the time order in which the interactions occur, the sequence diagram is quite valuable.

It is a type of interaction diagram that depicts objects as lifelines running down the page, with messages rendered as arrows from the source lifeline to the target lifeline to describe their interactions through time. Complex procedural logic is not intended for sequence diagrams.


You need to know the diagrams used to design and develop the Online Shopping Cart. That is because you cannot perfectly create a fully-functional system without it. But if you create this sequence diagram, you will know the series of processes and interactions that implies the system’s function. A sequence diagram guides the programmers with the system’s behavior through its’ interaction diagram.

The sequence diagram is used to model the system’s sequence of events. It describes the interaction between the users and the system. By completing the Diagrams per module or process, you will easily achieve your desired system. Check out our Related and Recommended Articles for more Learning and Information.


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