It should also provide ways to identify and correct mistakes without depending on publicity. I described how clear feedback mattered in engineering: a signal sent was not the same as a signal received, and an instruction given was not necessarily an instruction understood. I paused over that line. It echoed the day I had been ordered to reach for my identification and then punished for reaching. I left it in the essay because the principle mattered beyond my experience.
My phone rang. It was my niece calling from the lab. She said she had just finished testing a new version of her accessible service-counter device. The prototype still had problems, but the people who tested it helped her identify improvements she hadn't imagined. She sounded delighted by the criticism. I laughed and told her that was how I knew she was becoming a good engineer. She asked whether I could review the latest design over the weekend. I agreed. Then she asked whether I'd finished the essay. I told her I was close. She said her classmates would probably find it boring if I spent too long talking about documentation. I reminded her that documentation was what allowed people to learn from a test. She groaned affectionately and promised to read it anyway.
After the call, I returned to the notebook. I wrote about the responsibility of professionals who held power over others. Sometimes that power came from a uniform, sometimes from technical expertise, sometimes from the ability to decide which records were kept and which concerns were heard. The more power a person held, the more important it was to explain decisions and accept scrutiny. Confidence could be useful, but certainty unsupported by evidence was dangerous. I had seen that danger in a police lobby. I had also seen it in meeting rooms where officials tried to dismiss uncomfortable data. The form changed; the underlying error was the same.
I finished with a sentence that seemed simple enough to be understood by a student building her first circuit: if you want people to trust what you build, make it possible for them to tell you when it fails. I read it aloud. Then I closed the notebook. It was not a statement that could solve every problem. It was a direction worth following. My niece would probably find three ways to improve the wording, and I looked forward to arguing about each of them.