First things first: are you using the SVN version? BTW, I just updated the manual to make clear how maximize/minimize works. Next... On Sep 24, 2013, at 10:27 PM, Eric 'Siggy' Scott wrote: > I have tried this: > > multi.fitness.0.maximize=true > multi.fitness.1.maximize=false > multi.fitness.2.maximize=false > > And this: > > pop.subpop.0.species.fitness.0.maximize=true > pop.subpop.0.species.fitness.1.maximize=false > pop.subpop.0.species.fitness.2.maximize=false It's maximize.1, not 1.maximize. Any chance this is the issue? If we've got further concerns with per-objective maximization and minimization, time to call in Khaled, who was instrumental in updating ECJ to handle it. Sean