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4.3.2 Mutation     continued...

The control variable mutations can now be correlated according to the values of the rotation angles , while the standard deviations control the size of individual mutations. The parameter controls overall changes in mutability and parameter allows for changes in the individual `step sizes' .

This mutation mechanism enables the ES algorithm to evolve its own strategy parameters appropriate to the problem being tackled as the search progresses, a process termed self-adaptation by Schwefel [68].