Which design approach involves breaking a project into smaller pieces so that each piece performs a single task?

• A. Unit Testing
• B. Top-Down Design
• C. Agile Development
• D. Camel Case

Answer: (B)

Top-down design starts by outlining the big task and then breaks it into smaller parts, with each piece handling a single responsibility. This approach makes the overall system easier to understand, test, and maintain because you can focus on one well-defined function at a time and swap or modify modules without upsetting the whole project. For example, a weather app might start with the top-level function to display a report, then decompose into data retrieval, data processing, and formatting for display, and each of those into more specific tasks. This contrasts with unit testing, which is about verifying that individual parts work correctly after they’re built; Agile Development is a broader, iterative development approach; and Camel Case is simply a naming convention, not a design method.