Ironbear - How does that go ... every solution creates it's own problems. ;) shadownet - That's correct. All research work for this script is currently being done at a secret facility in South Korea. jwbaer - There is some optimization that occurs while the script is running. The genes in the new chromosomes that are in the 20% group I discussed above aren't generated like the genes in the first generation chromosomes. The genes in the first generation use the full range of the minimum/maximum limits. From the second generation on, the values for genes from the top 40% group are sorted to find the largest and small for each type of gene. These more limited mininum/maximum ranges are used to generate the new chromosomes to pad out that extra 20%. When I first tried this I was concerned that it might make the GA converge too quickly on a local minima. Fortunately, it is still loose enough to keep that from happening.