On the smaller problem (10,008 memb

On the smaller problem (10,008 members),with 12 runs and a limit of 500 evaluations, with no thresh old only two valid solutions were found, and no satisfactory solutions except the two that went onto be refined into valid solutions. Moreover, even though our best known solution is around 10 kips (kilo-pounds, i.e., 1000 pounds, a standard unit of weight in civil engineering), the two valid solutions had weights of approximately 24 and 388 kips. Obviously the latter is a very sub-optimal solution, more than an order of magnitude larger than the best known solution. Moreover, of the ten runs that never found even a satisfactory solution, most had maximum unity check values between 2 and 4, indicating that they were far from a solution, and six had weights ranging from approximately 2800 kips to 12700 kips. These were not close to finding desirable solutions.