I would imagine using an existing solution should be pretty straightforward, you'd simply set the previous solution as the initial solution in your next run: solver.setPlanningProblem(oldSolution); solver.solve(); There's unfortunately some unavoidable upfront cost to doing things that way, but the advantage is that you don't have to keep the solver running while you're waiting on a change. You can persist your previous solution and fire up a new solver if something changes. The other option is the real-time planning option mentioned in chapter 12. I haven't worked with it yet, but I believe you'd simply need to create a ProblemFactChange() with an onChange() method that applies the change to working memory the same way you would in doMove(), with scoreDirector.afterVariableChanged() calls, etc. I'm not quite sure how stable the real-time planning option is at the moment, though. -- View this message in context: http://drools.46999.n3.nabble.com/Reusing-a-Solution-in-Drools-Planner-tp... Sent from the Drools: User forum mailing list archive at Nabble.com.