In the pertinent literature, an ongoing discussion can be found about whether evolutionary algorithms are better suited for optimization or adaptation. Unfortunately, the pertinent literature does not o er a de nition of the di erence between adaptation and optimization. As a working hypothesis, this paper proposes adaptation as tracking the moving optimum of a dynamically changing tness function as opposed to optimization as nding the optimum of a static tness function. The results presented in this paper suggest that providing enough variation among the population members and applying a selection scheme is sufcient for adaptation. The resulting performance, however, depends on the problem, the selection scheme, the variation operators, as well as possibly other factors.