read barcode in asp net THE CYCLE OF TESTING, DIAGNOSING, AND FIXING in Software

Printer QR Code in Software THE CYCLE OF TESTING, DIAGNOSING, AND FIXING

THE CYCLE OF TESTING, DIAGNOSING, AND FIXING
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In the development stage, we are building and testing the product. But, if we are testing something, it might fail. Then what Then we need to diagnose the problem and repair it. The consequences of this test diagnose rework retest cycle are illustrated in the lower part of Fig. 8-1. Diagnosis and repair add tasks and time to our work schedule. And, when we are nished, we still have to run the test again. If the component does not pass, we go around the cycle again, as many times as necessary. When the component ( nally) does pass the second (or third, or fourth. . .) time, then we still face more work. The component we changed is now in a new version, and that version has not passed any earlier tests in the series of tests for this component. We need to restart the entire test series.
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PART TWO A Project, Start to Finish
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Iteration is a term that refers to any process that does, or might, repeat itself. Therefore, we see the test cycle as cyclic, or iterative. The test diagnose rework retest cycle is iterative, and that is why we do not have a test phase or stage in our methodology. The terms phase and stage refer to a set of related tasks done in parallel and in series, moving through time in a linear way towards a target date when we deliver the milestone. The linear progression of phases is illustrated in the upper part of Fig. 8-1. If we plan a test phase, we fool ourselves into thinking we know when testing will be done, when we will get out of the maze. But the very nature of a maze is that we cannot see its winding course. And the very nature of testing is that we do not know if the component will pass the tests, so we do not know what tasks we will have to do next. Testing is the process of ensuring that a component performs to both design and requirements speci cations. Quality management includes the processes required to ensure that the project will satisfy the needs for which it was undertaken. Therefore, in quality planning, we de ne and prepare the test plan, and we also de ne other procedures that help ensure quality process and quality results. Testing does not begin until the development stage, because there are no components to test until the team builds them. However,
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Fig. 8-1.
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Linear time in phases or stages vs. cyclic time in testing.
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CHAPTER 8 Development
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there is a process similar to testing in earlier stages. It is called review, and it is also cyclical. However, the review cycle is generally faster than the test diagnose rework retest cycle. When we evaluate written documents in review, we can usually see immediately what is wrong. Often, we can also make an appropriate x right away. When testing physical devices, software components, or other parts of a product or service, we are rarely so lucky. Diagnosis is usually a separate task, and rework almost always is. Testing begins during development, but review occurs in every stage because all documents should be reviewed. In concept, analysis, and design, all deliverables are documents, and all should pass review. That is why we allow time for the gates at the end of each of these stages, and include the possibility of rework. But if we want to pass through the gate easily, we should include a review cycle in our own schedule, before the gate. In development and transition to production, components should be tested, and documents such as the training plan, the user manual, any software code, and the software code documentation should be reviewed. Software code is an interesting case, because we can both review it as a written document and test it as a component. Generally, we should review it rst, because catching the errors in review will save a lot of time in testing. As we move through development, there is more and more testing. There is even more in transition to production. Also, as we put pieces together, we have to perform integration tests to make sure that they work together. With every test, our schedule has two elements of uncertainty: Will we need to do rework How much retesting will we have to do The uncertainty of the test cycle creates a management problem. We have the most uncertainty about the schedule near the end, when we have little time available before our delivery date. There is almost always a rush at the end. But there are several things that we, as managers, can do to handle the workload:  We can know that testing is cyclical, and build in extra time. How much time should we build in During analysis and design, it is not possible to estimate accurately the length of time rework and retesting will add to a project. We propose a rule of thumb, called the multiply by pi rule: General studies have shown that the average length of time for the testing phase is 3.2 times longer than the time it would take if all tests ran and no errors were discovered. Therefore, we suggest that you use a project tracking tool to arrange the test schedule and calculate the duration based on successful completion of all tests. Multiply this duration by 3.2 and allow that much time for the test diagnose rework retest cycle. Calling this multiply by pi reminds us of the
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