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Successful Software Development, Second Edition in .NET Development barcode data matrix in .NET Successful Software Development, Second Edition .net vs 2010 USS Code 128




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Successful Software Development, Second Edition generate, create none none in none projectscode 128 printing c# reduction of the testin none none g period. Usually there are no plans to pass through the testing period more than once. The testing period is often viewed as a "kick-the-tires" final inspection just before delivery, from which at most only a few discrepancies are expected.

With this concept, no recycling through a testing period is necessary. If there are only a few discrepancies in the computer code, this approach works satisfactorily. But if there are any substantial number of discrepancies, the testing period could become chaos without any systematic way (i.

e., defined acceptance testing cycle) of executing the test procedures, recording the results, filling out TIRs, and presenting the TIRs to a Test Incident CCB. The testing period could become a time of frenzied activity testing, correcting code in response to test incidents, and retesting all going on in parallel in a period of time that usually has been abbreviated because of slippage of the completion date of the computer code.

Reports of test incidents could be misplaced, corrected code could be overlooked, code changes could counteract other code changes. When the delivery date arrives (and delivery will occur on the specified delivery date), the state of the software is unknown. What discrepancies still exist What discrepancies have been overlooked In the period of frenzied testing activity, there is no time to document the changes made to the code or even to record which modules were changed.

Under these circumstances, maintenance of the software becomes very difficult. In this section, we looked in detail at the auditing process as it applies to computer code. We showed how this audit of code against requirements and design specifications is accomplished by executing code operating in a live or nearly live environment using written test procedures, the process we call T&E.

We pointed out how product assurance gives visibility during the acceptance testing cycle to the state of the Development and Operational Baselines through CCB minutes, TIRs, and written test procedures, and how it provides traceability during the transition from the Development Baseline to the Operational Baseline. Requirements Testability Example System LOOKOUT From the seller"s perspective, the bottom line of the software systems development process is to demonstrate formally that what the customer asked for is indeed embodied in the computer code and supporting databases to be delivered. In this book, we call this formal demonstration "acceptance testing.

" A fundamental premise of acceptance testing is that the functional capabilities that the customer wants (i.e., functional requirements) are testable.

A "testable requirement" is one that satisfies the following criteria:. Oracle Reports Service The requirement is suff iciently defined to permit writing test procedures that demonstrate whether or not the capability or capabilities defined by the requirement are embodied in the computer code and/or supporting databases. The test procedures are executable in a cost-effective manner..

Strictly speaking, a st none for none atement of functional capability that is not testable is not a requirement. If the presence or absence of such capability cannot be formally demonstrated, then it lies in an engineering netherworld. A key software systems development process challenge then is determining requirements testability so that the process can be brought to a successful conclusion.

Determining that a requirement is testable is, in general, a nontrivial endeavor. As we have reiterated, both the seller and customer progress in their understanding of what needs to be done as a project proceeds. This increased understanding often has a direct impact on establishing requirements testability as we now explain.

. Successful Software Development, Second Edition Elaborating on the prec none for none eding testability criteria, we say that a software requirement is testable if we can describe a cost-effective exercise of the requirement that can be performed on the computer hosting the software code and databases to be tested. Presumably such an exercise can then be broken down into a set of test steps that a tester can perform and a corresponding set of expected results that a tester can compare with the observed operation of the software code. As we have explained, the test procedure steps are accompanied by a set of expected results.

When the tester executes the test steps, the tester compares the result of software code operation against these expected results. If the results of this code operation do not agree with the expected results, the tester writes a test incident report to document this discrepancy. To illustrate in specific terms what is involved with establishing requirements testability, we examine a requirements specification.

The purpose of this examination is to focus on what is involved with conceptualizing such test exercises. Of course, strictly speaking, until such exercises are converted to performable test steps, requirements testability has not been formally demonstrated. Because test procedure development does not generally occur until some time after requirements are presented (and documented), demonstrating requirements testability is, in fact, an open issue until test procedures are written.

Frequently, it is not until test procedure writing begins that testability nuances surface again, because of the increased understanding of what needs to be done that naturally emerges when people are forced to think through how to demonstrate capability. To give you how-to-do-it insight into how to assess requirements testability from a requirements specification (before test procedure writing), we look at a requirements specification. This look will help you anticipate certain testability issues.

However, keep in mind the previously mentioned caveat until test procedure writing begins, the contents of the requirements specification may still need to be reworked to transform previously considered testable statements into testable statements. It should be noted that the requirements specification that we consider is adapted from an actual specification that contained testability issues that were dormant for years until the project adopted a formal approach to testing that included preparing written test procedures derived from requirements (prior to adopting the formal testing approach, the project used a cursory, "kick-thetires" approach). Figure 5-44 shows a two-page document entitled "Subsystem Requirements Specification for Earth Surface Areas.

" As section 1 of the document indicates, a computer subsystem is supporting the operations of the meteorological satellite system LOOKOUT. Among other things, LOOKOUT monitors weather activity over various parts of the earth. In support of this monitoring, the computer subsystem includes the capability to allow its users to define rectangles on the earth"s surface (called "spherical rectangles") that serve as reference areas for weather observations (e.

g., to observe what percentage of the time the area is cloudless)..

Successful Software Dev elopment, Second Edition Figure 5-44 This requirements specification provides the backdrop for illustrating the concept of requirements testability..
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