# Design responses

 A design response: is a single scalar value, such as the volume of your structure; is calculated by the Optimization module by reading results and model data from the output database file; can be referred to from objective functions and constraints (for example, you can create an objective function that tries to minimize the displacement at a node or a constraint that forces the weight of the structure to be reduced by at least 50%); and is available only for certain analysis procedures (for example, you must perform an eigenvalue extraction analysis if you select a design response that tries to maximize the lowest eigenfrequencies). The following topics are discussed:
 Related Topics About structural optimization In Other Guides Configuring design responses

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