Changes to the RSM parameters are increasingly drastic as shown in the following list:
Facode - Change the function approximator used by the RSM algorithm. This may
be done as more data is gathered and you have a better idea of what
yields the best function approximator.
OptState - In general, changing this could be a dangerous thing since optstate
is something these algorithms keep for their own benefit.
Currently, base is the only to change and that is fairly safe.
OptPars - Changes here amount to changing the solution you are using on
your problem.
TaskSpec - Changes here change the problem being solved.