A use case is a structured, written scenario that describes how a user (actor) interacts with a system to achieve a specific goal. It outlines the sequence of steps, from the user’s action to the system’s response.
Here is a detailed breakdown of a specific use case based on a common scenario: Example: Customer Transfers Money via Mobile Banking App Actor: Bank Customer System: Mobile Banking Application Goal: Transfer money from checking to savings. 1. Scenario Steps Actor logs into the mobile app. Actor selects the “Transfer Funds” option. System displays the transfer screen, showing accounts.
Actor selects “Checking” as the source and “Savings” as the destination. Actor enters the amount to transfer. Actor clicks “Submit”.
System validates funds, processes the transfer, and displays a confirmation message. 2. Key Components of this Use Case Actors: The user(s) interacting with the system. System: The technology performing the actions. Goal: The final result (money moved).
Preconditions: The user must be logged in and have a positive balance.
Exceptions (Alternative Paths): If the user has insufficient funds, the system displays an error message instead of completing the transfer. 3. Why Use Cases Matter
Requirements Gathering: Helps developers understand exactly what the software needs to do.
User Perspective: Focuses on the user’s story rather than just technical specs.
Testing: Acts as a guide for testers to ensure the system works as intended.
This video provides a practical example of a use case description:
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