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Want some easy rules to follow to ensure you do n't have to deal with this scenario ? One rule of thumb is that computing power will continue to double every two years.Along with these advances in " hardware , " there have been many innovative advances in " software " ( the programs which tell the computer what to do ) . Amazingly , very different systems seem to be governed by the same , universal rules . Formal power series in the perturbation parameter can be writtenfor the invariant tori of Hamiltonian systems close to integrable ones.Convergence can be proved only in special cases ( KAM theory or periodicmotions ) : more generally the series have to be summed with suitablesummation rules obtaining nevertheless nontrivial analyticity properties in the ( small ) perturbation parameter . The most important rule of Web communications is identifying your audience and targeting content to meet their needs .