Confidence is good, but to be in control is better! Our journey to write a general introduction to control and feedback started with the realisation that in our chosen field of study the proponents have taken little time to project the main ideas outside the community of the initiated. We are constantly - minded of the fact that there is no general awareness of control engineering, or c- trol technology, despite its ubiquity when we try to introduce ourselves as control engineers. Invariably ...