What Is an Agile Methodology in Visual Studio .NET

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1 What Is an Agile Methodology
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It will always be necessary, and sometimes possible, to backtrack around some of the stages, but the emphasis is on a trying to identify the requirements in one go. The diagram in Fig. 1.1 tries to illustrate the approach. The need to respond more quickly to the changing nature of the customer s needs does not sit easily with this type of model. The rst two key issues are, therefore, to nd an approach that retains a continual and close relationship with the client, and to nd an approach to development that does not involve the heavy overhead of a long and complex design phase. If this is achieved, then the development process might be more able to adapt to the changing requirements. There are a number of other approaches to software development that have attempted to address these issues. The spiral model (Sommerville, 2006) describes this approach (Fig. 1.2). It involves a series of iterations around the requirements capture or speci cation implementation testing or validation delivery and operation loop together with periodic reviews of the overall project and the analysis of risks that have been identi ed during the course of the project. It attempts to recognize that for many projects, there is an ongoing relationship with the customer that does not end with the delivery of the system but will continue through many further stages involving correcting and extending or adapting the product. In these cases, there is no such thing as a nished product. Rapid applications development and evolutionary delivery are similar sorts of approaches that are built around the idea of building and demonstrating, and in the latter case delivering, parts of the system as the project goes along. Such approaches can be successful but differ in many ways from the approaches taken by the current agile or lightweight methodologies, one of which we are considering here. One issue is the length of an iteration cycle; in agile approaches, these are very short.
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Figure 1.1 The waterfall model of software development.
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1.4 Evolving Software: Obstacles and Possibilities
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Figure 1.2 The spiral model.
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There have been many analyses of failed software development projects. Failures in communication, both between developers and clients and between and among developers, seem to be some of the most common causes of problems. In the traditional approach, the various documents (requirements documents, design documents, etc.) are supposed to facilitate this communication; however, often the language and notation used in these documents fails to support effective communication. UML (Uni ed Modeling Language) diagrams, for example, can often be interpreted differently by different people.
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1.4 EVOLVING SOFTWARE: OBSTACLES AND POSSIBILITIES
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Even if we are able to deliver a solution that is still relevant, it may not remain so for long. Things are bound to change, and there is thus a need to see how we can evolve the software toward its new requirements. Some of the old functionality is likely to remain, however, so it would be inef cient to throw it away and start again. How can we develop a method whereby changes can be achieved in the software quickly, cheaply, and reliably Agile techniques are an attempt to answer some of these questions. Many systems will involve a database somewhere, and this is one of the key issues when it comes to obstacles to evolution. Traditionally we use a relational database structure and a relational database management system to manage it. Much time is spent building and normalizing the data model. When circumstances change, however, the data model may not still be appropriate. What can we do about this It may not be a straightforward matter to reengineer this data model. It may not be possible to just insert a couple of new elds or a new table or two. It is likely that the whole data model will have to be substantially reengineered, and this could be expensive. What are the requirements of a software engineer when faced with the problem of adapting an existing or proposed system to deal with some new requirements
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