Which aspect is primarily verified through testing in design?

Functionality and usability are central to the purpose of testing in design. When a product is tested, the primary aim is to evaluate whether it performs as intended and meets the user’s needs. This involves assessing how well the design functions in real-world applications and ensuring that it is user-friendly, intuitive, and effective in solving the problem it was created for.

Testing allows designers to gather feedback on how users interact with the product, identifying any issues that may hinder the usability or performance. For instance, a testing phase may reveal that certain features are difficult to navigate or that the product fails to operate under specific conditions. This vital information helps designers make necessary adjustments to improve the overall experience and ensure that the end product meets the design specifications.

While aesthetics, cost-effectiveness, and production efficiency are important aspects to consider throughout the design and production process, the main focus during testing revolves around how the product works in practice and whether it fulfills its intended purpose. Ensuring that a product is functional and usable is paramount, as these qualities directly influence customer satisfaction and the product's success in the market.