Use Case

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What is a Use Case?

A use case is a tool in software development that helps explain how users interact with a system to reach a specific goal. It outlines the steps a user (called an actor) takes to complete a task with the system. Use cases make it easier to understand what the system should do from the user’s perspective.

Every use case contains three essential elements:

Actor: The person or system that interacts with the system (for example, a customer or an admin).

Goal: The specific outcome the actor wants to achieve.

System: The processes and steps the system follows to help the actor reach their goal.

Example:

Imagine an online store where a customer wants to buy a product.

  • The actor is the customer.

  • The goal is to complete a purchase.

  • The system manages the shopping cart, payment processing, and order confirmation.


Why Use Cases Are Important

  • They clearly organize and explain system requirements.
  • They help identify potential problems or errors early.
  • They serve as a basis for creating test cases.
  • They are easy for everyone—developers, testers, and business people—to understand.
  • They help prevent unnecessary or out-of-scope features.
  • They guide project planning, writing user manuals, and testing.
Writing use cases is important because they clearly show how users interact with a system and what the system must do. They help catch problems early, guide testing, and keep projects focused on real user needs, leading to better software and smoother development.

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