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Is there an ideal
level of a particular type of diversity? The two recognised phases of
the evolutionary process, exploration followed by
exploitation [Eiben and Schippers, 1998],
make this question difficult to answer.
Without knowing a priori the existence of a type and
ideal levels of diversity, blindly controlling diversity in a population
Instead, two different diversity strategies may be required:
a diversification and an intensification strategy, similar to
those explicitly defined in tabu search [Glover and Laguna, 1997].
A related method was recently defined in
genetic programming based on edit distance and adaptive
control based on fitness improvement [Ekárt and Németh, 2000].
However, the exploration and exploitation aspects of search are not the
only issues to consider when attempting to control or modify
A fuller discussion of methods used to control diversity is
presented in Chapter 4.