This collection of essays provides key insights into the role of the professional engineer and in particular the nature of professional engineering judgement: what it is, how to get it, how and when to use it. The author also draws upon his experience in the process industries to answer some crucial questions, including: What obligations are placed upon you as a professional? What is the value of a bar stool to a professional engineer? Why Galileo's trial in 1633 is still relevant to engineers today.