A design variable is a parameter or value that can be adjusted in the process of designing a product, system, or process. It is used to specify the characteristics, behavior, and performance of the design. For example, in the design of a car, the design variables might include the car's dimensions, weight, engine power, fuel efficiency, safety features, and overall appearance. These variables can be adjusted and optimized to achieve the desired design goals, such as maximizing performance while minimizing cost.
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