Which term is used for rough drawings that convey or refine an idea?

• A. Prototypes
• B. Surface modelling
• C. Sketches
• D. Top-down modelling

Answer: (C)

Sketches are quick, freehand drawings used to convey or refine an idea. They’re informal and fast, letting you explore shapes, proportions, and concepts without details or precision, so you can iterate ideas and share intent with others early in the design process. This makes them ideal for brainstorming and communicating concepts before moving on to more polished forms or simulations. Prototypes involve more developed, testable versions; surface modelling is a CAD technique for creating smooth geometry; top-down modelling is about refining a project from a high-level concept downward. The rough, exploratory nature of sketches is what makes them the best fit for conveying and refining ideas.