Diversification isn't supported in Drools Planner yet. But patches are welcome :) You 'd have to go into the drools planner code, which isn't that hard. See the latest manual how to build it from source. https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/t... Take a look at the default selector, it gets the deciderScope as a parameter. The DeciderScope has the stepScope and the stepScope has the score of the last step, just what you need :) Just build your own selector or better yet, adjust the default selector, and run some experiments. Clean it up and feel free to make me a patch and a jira issue and I 'll peer review it, improve it even more and add it to the trunk code. With kind regards, Geoffrey De Smet dmzpippo-drools(a)yahoo.it schreef: