# Sensitivity interface at Material Level
Return to Extension of an existing material,cross
section, and element for DDM-based:
The following functions need to be implemented in each material for
sensitivity computation:
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int setParameter (const char **argv, int argc, Parameter ¶m);
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int updateParameter (int parameterID, Information &info);
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int activateParameter (int parameterID);
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double getStressSensitivity (int gradIndex, bool conditional);
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double getInitialTangentSensitivity (int gradIndex);
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int commitSensitivity (double strainGradient, int gradIndex, int
numGrads);
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double getStrainSensitivity(int gradIndex);