Hi all, I am writing an particle swarm optimizer that tries to find good floating point values for optimization problems. I have several test cases, and some target fitness value that the optimizer should be able to reach. The problem is that since such optimizers make lots of use of random numbers, so the optimizer can only find in about 90% of the cases the target fitness value. I can relax the target fitness value, than 95% of the runs are ok; but that is not really a solution. Any ideas how to write tests when you have such an uncertainty about the result? Martin