Preface

Q. What is the shortest word in the English language that contains the letters a, b, c, d, e, and f?

A. Feedback.

My feedback journey

I clearly remember the first time that I was introduced to the concept of feedback; it was in an Electronics lesson, rather strangely. The class lecturer stood at the blackboard with a piece of chalk (as they did in the last century) and drew the following diagram:

My feedback journey

He then made a rather bold claim about the meaning of feedback:

"Taking a portion of the output and comparing it with the input to decide whether you are getting what you want out of a system."

And in a beautifully simple way, he gave me a definition ...

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