What does modularity mean in robotics design?

• A. Building systems as separate interchangeable modules to simplify development and maintenance.
• B. Integrating all components into a single, inseparable system.
• C. Designing modules that cannot be replaced.
• D. Prioritizing speed over reliability.

Answer: (D)

Modularity means designing a robot as a set of distinct, interchangeable modules that can be developed, tested, and swapped independently. This approach makes development and maintenance easier because you can update or replace a single module without changing the rest of the system. It also supports customization and upgrades: you can mix and match modules—for example, swap in a different sensor package or a different drive system—to fit different tasks or budgets, and different teams can work on separate modules in parallel.

That description fits modularity best because it centers on separation and interchangeability of parts, which is the core idea behind modular design.

The other ideas don’t fit modularity. Building everything as one inseparable system eliminates the ability to swap or upgrade parts. Making modules that cannot be replaced defeats the purpose of having modular components. Prioritizing speed over reliability is a performance trade-off, not a statement about how the system is structured or organized.