Modelling and Designing Software in Visual Basic .NET

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123 Modelling and Designing Software
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Having decided on a life-cycle model to use, we need to adopt a set of tools that, where possible, will assist us at each phase The obvious phase in which to employ a tool is the implementation phase, and here we will use our programming language, Visual Basic NET, to create the program code that will be delivered to the customer However, within the other phases it would be useful to have tools and techniques to use to document the system requirements and designs Over the years in which software development has grown into a major industry, a variety of development methods have come into fashion Many have since gone out of fashion (who remembers OODLE ) as new, re ned methods have been developed The Uni ed Modeling Language or UML is a set of techniques used to develop software and has in recent years gained widespread industrial acceptance It is now the industry standard for a wide range of types of software project The range of methods that make up UML form a framework that covers the software development lifecycle, providing speci c methods for performing all of the necessary analysis, design, construction and quality-assurance tasks for software projects of any size
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1 n Software Development and NET
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UML provides us with ve distinct views of a system, sometimes referred to as the 4 +1 view model
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The use-case view allows us to depict the behaviour of a system from the perspective of an external observer It de nes the requirements of the system, and is of particular interest to software analysts, testers and end-users (normally considered to be the customer we are developing for) The design view describes the logical structures that support the software requirements, and consists of class de nitions and how classes interact and relate to each other The implementation view describes the physical components of the system, such as program code les and assemblies, databases and con guration les The process view depicts the ways that elements of a software system interact over time, and gives us a way of modelling the behaviour of a system that dynamically changes its structure as it performs its job The deployment view describes how the physical components of a system (the objects and assemblies of objects) are organized within their physical environment, such as a computer network, a workstation or the Internet
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UML provides a very detailed description of a computer software system from every useful perspective To do this, it employs mainly diagrams, although textual annotation is used to add detail that would be cumbersome to put into a diagram The aim of a UML model of a system is to create a paper (or screen) model of the system that is complete and unambiguous, and in doing so to make it easy to design a system, communicate the designs to other interested parties (such as co-developers and end-users) and change the model of the system as anomalies or changes in requirements become apparent We will use a subset of UML consistent with the sizes and types of program we will develop through this book
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Software Requirements Speci cation
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The rst real stage of development involves identifying what the software has to do This is generally considered to be the most dif cult part of software development The problem is that programmers and end-users do not speak the same language even when both speak English A seemingly simple request, like I would like to record a log of all of the communication we have with each customer is likely to be interpreted differently by each software developer that is asked it The usual way to overcome this dif culty is to maintain a constant dialogue with the software end-users or customers In this way ambiguities can be resolved before too much development work is done on wrongly interpreted requirements Evolutionary prototyping can help here by allowing the end-user to see and work with an early version of the software and correct any misconceptions On the face of it, stating software requirements is a simple process; look at the work the software is to do, divide it up into statements of speci c functions,
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