I'm interested in initializing the initial population by using randomly generated individuals at the one hand (using grow, half, or uniform), and by reusing individuals from previous optimizations on the other hand. Is this basically possible? Is there any documentation about seeding? As far as I know, when specifying pop.subpop.0.file=$myFile the initial population will be created from the individuals from the given file. Why is it important to have the fitness value also saved to this file? The current optimization could use a different fitness function and hence this value would be irrelevant. Furthermore, I'd like to have an initial population containing 50 individuals. The seeding file contains only 10 individuals. How can I specify that the remaining 40 individuals shall be generated using a built-in tree builder (such as grow)? Thanks for any help, Stefan Mit freundlichen Grüßen / Kind regards Stefan Wappler DaimlerChrysler Automotive IT Institute Ernst-Reuter-Platz 7 10587 Berlin/Germany Phone +49 (0)30 39982 358 Fax +49 (0)711 3052 160825 mailto: [log in to unmask]