Figure 6From: Assessing the benefits of search-based approaches when designing self-adaptive systems: a controlled experiment Example of reference Pareto-front P â and Generational Distance ( GD ) metric. GD finds the average Euclidean distance from each i-th solution in Q to the nearest solution in P â. The lower the GD value, the more effective are the architectures regarding self-adaptation quality attributes. The style-based architecture r is shown as more effective than those produced by the search-based approach. That is one of the null hypotheses investigated herein.Back to article page