SOME AGILE METHODOLOGIES in .NET

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SOME AGILE METHODOLOGIES
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There are a number of possible contenders for the description of an agile methodology. We will look at some of the more popular ones, leaving extreme programming until the next chapter where we will look at it in more detail. This account is not
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1 What Is an Agile Methodology
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exhaustive but is meant to provide some ideas of the different directions in which agile development is going.
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Dynamic Systems Development Method
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The dynamic systems development method (DSDM) (Stapleton, 1997) is an approach that uses an iterative process based on prototyping that involves the users throughout the project life cycle. In DSDM, time is xed for the life of a project rather than starting with a set of requirements and trying to keep going until everything has been done or we have all given up! Thus resources are xed as far as possible at the start, and this can provide a more realistic planning framework for a project. This means that the requirements that will be satis ed are allowed to change to suit the resources available. There are nine underlying principles of DSDM, the key one being that tness for business purpose is the essential criterion for the acceptance of deliverables. This philosophy should ensure a clearer focus on the purpose of the software rather than on technology for technology s sake.
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The Underlying Principles
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The following principles1 are the foundations on which DSDM is based. Each one of the principles is applied as appropriate in the various parts of the method. 1 Active user involvement is imperative. Users are active participants in the development process. If users are not closely involved throughout the development life-cycle, delays will occur, and users may feel that the nal solution is imposed by the developers and/or management. 2 The team must be empowered to make decisions. DSDM teams consist of both developers and users. They must be able to make decisions as requirements are re ned and possibly changed. They must be able to agree that certain levels of functionality, usability, and so forth, are acceptable without frequent recourse to higher-level management. 3 The focus is on frequent delivery of products. A product-based approach is more exible than is an activity-based one. The work of a DSDM team is concentrated on products that can be delivered in an agreed period of time. By keeping each period of time short, the team can easily decide which activities are necessary and suf cient to achieve the right products. 4 Fitness for business purpose is the essential criterion for acceptance of deliverables. The focus of DSDM is on delivering the essential business requirements within the required time. Allowance is made for changing business needs within that time frame.
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These are taken from the DSDM site: http://www.dsdm.org.
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1.8 Some Agile Methodologies
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5 Iterative and incremental development is necessary to converge on an accurate business solution. DSDM allows systems to grow incrementally. Therefore the developers can make full use of feedback from the users. Moreover partial solutions can be delivered to satisfy immediate business needs. Rework is built into the DSDM process; thus, the development can proceed more quickly during iteration. 6 All changes during development are reversible. To control the evolution of all products, everything must be in a known state at all times. Backtracking is a feature of DSDM. However in some circumstances, it may be easier to reconstruct than to backtrack. This depends on the nature of the change and the environment in which it was made. 7 Requirements are baselined at a high level. Baselining high-level requirements means freezing and agreeing on the purpose and scope of the system at a level that allows for detailed investigation of what the requirements imply. Further, more detailed baselines can be established later in the development, although the scope should not change signi cantly. 8 Testing is integrated throughout the life cycle. Testing is not treated as a separate activity. As the system is developed incrementally, it is also tested and reviewed by both developers and users incrementally to ensure that the development not only is moving forward in the right business direction but also is technically sound. 9 Collaboration and cooperation between all stakeholders is essential. DSDM is independent and can sometimes be used in unison with other frameworks and development approaches, such as extreme programming (XP).
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