In the example PID values computed using old-fashion PID tuning parameters will be compared with PITOPS for the same disturbance (DV) change. Since this is a temperature controller, it needs to have very tight and stable control action without and oscillations after disturbance appearance. Due to comparison simplicity PID tuning method trends will be shown one after another. IMC and Lambda PID tuning methods produce similar behavior where calculated PID tuning parameters gives very slow and sluggish control action which cannot reject typical process disturbances, as shown in Figure 10. ZN and CC PID tuning methods also give similar but too aggressive behavior where oscillations are visible after each disturbance, as shown in Figure 11. PITOPS PID tuning method provides optimal PID tuning parameters which produces tight, stable and fast disturbance rejection control action behavior as required for the process and shown in Figure 12.