Final answer:
A design specification is used both before and after prototyping to ensure that the design meets the desired requirements and constraints.
Step-by-step explanation:
A design specification is used both before and after prototyping to ensure that the design meets the desired requirements and constraints. Before prototyping, a design specification helps define the requirements and constraints of the design. This includes determining the shapes, dimensions, materials, and fabrication processes that will be used. After prototyping, the design specification is used to evaluate whether the prototype meets all the constraints and performs acceptably. This helps identify any weaknesses in the design and provides information to refine and improve it.