Figure 4. Sample populations of queries obtained for the topic, Solar System.

The initial population (identical for all the strategies) is shown on the left. The other charts correspond to the evolved populations for the baseline Co1 (center) and Co3 (right). The convex hulls of the Pareto fronts are represented by lines. The dispersion observed in the three charts allows to appreciate the diversity at the phenotype evaluation level of the initial population (random queries), a population evolved by a strategy that does not prioritize diversity (Co1), and a population evolved by a strategy that attempts to preserve diversity Co3.