Hello, my name is Adrián. I am new using ECJ and I do not know if this is the right way to ask for help. So if it is not, please tell me where can I ask for it. I need to define constraints between the parameters of an individual, for example one parameter has to have bigger value than other parameter. I have checked the ECJ manual but I do not find the way to do it. Constraints could be establish through fitness penalizations, but I was wondering if there is another way implemented in ECJ. I really appreciate the help, thanks in advance.