How efficient and versatile is it?
The Efficiency criterion examines how effectively your product uses resources during its use phase, including energy, materials, water, space, and human effort, and how versatile it is across different use contexts.
A strong answer demonstrates that the product delivers its function with minimal resource consumption, and that its design avoids unnecessary waste in use. Versatility (the ability to serve multiple functions or users, or to adapt to different contexts) is a form of efficiency at the system level: a product that replaces several single-purpose items is more resource-efficient than each of those items individually. A weak answer focuses only on technical performance without considering the full resource profile of the use phase.
Efficiency in use is distinct from efficiency in manufacture, though both matter. This criterion focuses specifically on what happens when the product is in the customer’s hands: how much it consumes, how little it wastes, and how broadly it can serve.
