Lecture 6b for Control Systems Engineering (UFMEUY-20-3) and Industrial Control (UFMF6W-20-2) at UWE Bristol. This lecture covers the same material covered in lecture 6a, to aid understanding. This lecture is presented by Neil Larsen.This lecture introduces frequency response, amplitude ratio and phase angle. Ways to represent frequency response graphically are introduced using the Nyquist Diagram and Bode plots. An example of constructing a bode plot is shown. System identification is also included, with an example problem describing how a transfer function can be found from the bode plot.