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Document the Expected State
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Engineers and programmers have one thing in common: They re both lousy at documenting their work. There are many reasons for this de ciency, including the schedule doesn t allow for the time to be taken during the development process to document the project, the design isn t nished and the documentation won t be accurate for the nal version so there s no reason to bother, it s somebody else s responsibility, or the plain truth, it s boring and generally unrewarding to do. This means that chances are that nobody has spelled out exactly what the system is supposed to do. Not having a good description of what the system is supposed to do (its expected state) makes it virtually impossible to x the problem. I would argue that you can t claim to have a problem if you can t point to a document that states how the application is supposed to work and be able to explain how the actual application deviates from its expected, documented operation. This step probably will seem redundant or even trivial; for example, you might have a situation where your application catches on re it will seem unnecessary to document that it should not burst into ames. However, documenting the expected operation and state of the application will provide you with the
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CHARACTERIZE THE PROBLEM
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means of plotting where the actual system execution deviates from the expected path when you start characterizing what is actually happening. The better the description of the expected operation (or state) of the application, the better chance you will have of reaching to the best solution. If you have a liquid-crystal display (LCD) that isn t working correctly, you might be tempted to state that it is displaying an incorrect message. Documenting what the message should be could help to point you to a disconnected data bit wire that causes characters to be displayed as if that wire s bit value were always 0. Or it could point you to a software problem. The better the understanding you have of the expected state and having it written down to compare with your actual results, the better you will be able to characterize the problem and select the best possible x. Note that fully documenting the proper operation of the system is often not something that can be done immediately. You may have to go back and edit your expected state documentation because of what you have learned through the process of characterizing the problem or hypothesizing about what is causing the problem. However, I would not recommend that you start trying out xes unless you fully understand what the expected operation of the application is, along with its expected state when the problem occurs. For the example of the ooded basement, the expected state during a downpour is that any water near the cinder block basement walls will be drawn away by the weeping tiles and drainpipe at the base of the house. A more obvious expected state is that the basement shouldn t ood during a rainstorm, but this is less helpful and will not help you to get to the desired result xing of the problem. Understanding this expected state was achieved through discussions with home builders because I am not an expert in home basement construction.
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Characterize the Problem
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Being able to describe the problem accurately is critical to being able to x it successfully. Even if your PIC microcontroller application just seems to be sitting there and doing nothing more than draining your batteries, there is information that you can nd that will help you to gure out what the problem is. On the other end of the spectrum, you may have an application that fails after only a couple of hours of operation. In either case, recording what happened leading up to this state, as well as the system s operation at the time of failure, will give you information that you can compare against the expected state documentation your created earlier. The process of looking at a failing application and detailing all the relevant information about its operation and the environment that it is working in is known as error characterization. One attitude that I feel is critical for failure analysis is being suspicious of anything that doesn t feel right and documenting what you are unsatis ed with. Suspicious activity could be a motor that doesn t respond as quickly to a button press at certain times or a light-emitting diode (LED) that appears to icker. I have worked with a number of people over the years who have let problems escape out the door simply because they
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