There are basically two aspects in obtaining this definition, namely the specifications and performance parameters or standards of performance. Roughly speaking, specifications refer to the normal function requirements of a design that every design concept must meet, and standards of performance refer to those standards against which the competing designs can be judged.
The same requirement can have two different roles under two different design conditions. The cost of a car may be a specification if we are designing one for the middle-income group, but only a standard of performance will be the requirement if for entering it in an automobile race.
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