Lifecycle Models And Methodologies Essay

2588 words - 10 pages

IntroductionLifecycle models where developed in order to carry out tasks in a structured and logical way. Assuming that a project proceeds in a normal and orderly manor, there are steps that need to be followed, depending on what the particular project is. A good example of this would be; Requirements analysis, functional specification, design, implementation, testing and maintenance.There are several types of lifecycle models. Two of the most commonly used are the waterfall lifecycle and the spiral lifecycle.The Waterfall Lifecycle ModelThe waterfall lifecycle was the first publicly documented life cycle model. The model was developed to help cope with the increasing complexity of aerospace products. It was first documented by Royce in 1970. The waterfall lifecycle is in theory a sequential model but as indicated in the example above by the upward pointing arrows it is necessary to be constantly going back and going over what has already been done. This could be for trouble shooting or quality control proposes for example. It many cases it is not possible to continue the current task if the previous task is incomplete. On the other hand, if possible, it may suit the timetable of the particular project if two of the stages overlap each other. It would depend on the project that was being worked on.As the waterfall model is a sequential lifecycle model, it is widely used in the manufacturing industry. A good example of this would be the motor industry as cars are assembled sequentially.The advantage of the waterfall model is that it a very ordered lifecycle and it is clear to see the direction in which a project is heading. One of the down sides is however is the customer or client may have difficulty stating explicitly the requirements at the start of the development because a working version is not usually available until late in the development lifecycle.In the example above there are five main stages. The first stage is requirements analysis. This stage would involve the client telling the analyst what is required. The second stage is a more detailed explanation of what the system is required to do. The third stage is the actual design of the project. The fourth is the actual work starting on the project and the fifth stage is the testing. The testing would probably involve the client watching the system in action and ironing out any faults. A sixth stage involving maintenance is a common practice as it is very important that the system continues to work in the intended manor. This would involve the client calling in a consultant from time to time. It is very often the case that the consultant has previously worked on the original design of the system. This makes good sense, as the analyst would know the system better than an outsider. This would apply with most lifecycle models.The Spiral Lifecycle ModelThe spiral lifecycle model was invented by Barry Boehm in 1985. This is a good lifecycle for software development because it is designed for...

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