Which term represents the ability of a product to maintain its function over time?

The ability of a product to maintain its function over time is best represented by the term "quality." Quality encompasses various characteristics that determine a product's durability, reliability, and overall performance throughout its lifespan. When a product is of high quality, it means it has been designed and manufactured to withstand wear and tear, perform reliably under various conditions, and continue to meet user expectations long after its initial use.

This understanding of quality is crucial in design and technology, as it guides engineers and designers to prioritize materials, processes, and standards that contribute to the longevity and effectiveness of a product. High-quality products often provide greater customer satisfaction and value, reducing the need for frequent replacements or repairs.

In contrast, while cost-effectiveness relates to the financial aspect of making a product, suitability pertains to how well the product meets the intended needs, and aesthetics refers to its visual appeal, none of these directly address the aspect of maintaining function over time in the same manner that quality does. Therefore, quality is the most appropriate term for describing a product's long-term performance and reliability.