Use Case Diagram – Amazon E-Commerce Platform

A use case diagram is a visual representation of the interactions between actors (external entities) and the system (Amazon, in this case). It shows who does what, helping students visualize functional requirements.

Actors Involved:

1. Customer
2. Seller
3. Admin
4. Payment Gateway
5. Delivery Partner
6. Guest User

Primary Use Cases

For Customer:

• Register and Login
• Search Products
• View Product Details
• Add to Cart / Wishlist
• Place Order
• Make Payment
• Track Order
• Cancel or Return Order
• Rate and Review Product

For Guest User:

• Browse Products
• View Offers and Categories
• Register / Login to make a purchase

For Seller:

• Register as Seller
• Add / Update Product Listings
• Manage Inventory
• View Orders
• Ship Product
• Respond to Customer Queries

For Admin:

• Approve Seller Accounts
• Block Suspicious Users
• Manage Product Categories
• Monitor System Activities
• Handle Customer Complaints
• Manage Promotions and Ads

For Payment Gateway:

• Process Payment
• Authorize Transactions
• Handle Refunds

For Delivery Partner:

• Accept Order Pickup
• Update Delivery Status
• Confirm Delivery or Return

Diagram Description:

• Actors are placed outside the system boundary (a rectangle).
• Use cases are represented as ovals inside the system.
• Lines connect actors to the use cases they are involved in.
• You may use <<include>> and <<extend>> relationships where:

• • <<include>>: Shared logic between use cases (e.g., Payment included in Place Order).

  • <<extend>>: Optional or conditional logic (e.g., Guest user extends to Register).