$9\mathrm{.}4.$ The dynamic responses shown in Figure Q$9\mathrm{.}4$ were obtained by introducing a step set point change to a PID controller. The dead time of the process is only a few minutes. For each case, determine whether the control is as good as possible and if not, what corrective steps should be taken. Note that the diagnosis of this data would require an exact specification of the control objectives. Use the general objectives considered in Table $9\mathrm{.}1$ and be as specific as possible regarding the change to the tuning constants.