Working Up

by Dwayne Phillips Agile development is not an excuse for knowing what you did, why you did it, and how you did it. You’re doing agile development. You hold a meeting to start a sprint (different methods use different names for this). You sprint! You meet again at the end of the sprint. What did […]

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by Dwayne Phillips Excellent maintenance sometimes indicates a faulty product or service. Sometimes, no maintenance indicates a superior product or service. I first encountered this over 20 years ago. We had purchased similar products from two companies, let’s call them Smith Inc. and Jones Inc. for now. The conversation went something like… “What happens when […]

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by Dwayne Phillips Analysts seek to find the difference that makes a difference. What can be vexing is that often there is no final difference. I believe that technical analysis and the analysis of technical systems comes to one question: What is the difference that makes a difference? Is it temperature that makes one system […]

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by Dwayne Phillips One function of systems engineering is to open the black boxes, look at the entire system, and apply some wisdom. We often build systems by connecting existing systems and subsystems. These existing pieces are black boxes, i.e., we don’t know or don’t care to know what is inside them and how they […]

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by Dwayne Phillips What does this thing do? Exploring the question is the act of analyzing a black box. Reveal the results of black box analysis carefully. I often encounter systems for which I have no knowledge of their inner workings. Airline reservations, online retail, job listings and applications, etc. I don’t know how they […]

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by Dwayne Phillips Working software is more valuable than documentation—except when it isn’t. And we have Dwayne’s Declaration. Part of the Agile Manifesto states: We…value working software over comprehensive documentation Some of us are old enough to have known this years before the manifesto was manifest. Of course we wanted working software, except when we […]

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by Dwayne Phillips Sometimes the cheapest and simplest part of a system is the one that fails and you may have to buy half a dozen of them to find one that works. I had a bad experience repairing that large appliance in the bathroom. Did you know that you can crawl under a toilet? […]

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by Dwayne Phillips We give new titles to an old profession. Back in the last decade of the prior century, I met several people at work who had one skill: They could read a product catalog. They would read the catalogs from DEC, Sun, IBM, and even Dell. They would proclaim, “Look what is out […]

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by Dwayne Phillips Regardless of what Excel tells us, significant digits (remember that?) tells us otherwise. Recall something called significant digits from high school math? Consider calculating something with two numbers. One number has two digits while the other number has three digits. The answer can only have two digits. For example, 23 x 123 […]

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by Dwayne Phillips When you rely upon things from other people, you are sometimes greatly disappointed. This holds for programming computers. Are you a “full-stack developer?” Do you argue about what a full-stack developer is? Have you been asked, “Given this problem, what stack would you use?” Sigh. Since the pre-historic times of computer programming, […]

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