In this stage, the final user testing and training are conducted. This stage is called the Deployment stage. In this stage, the complete lifecycle of development, testing and requirement refinement is repeated until final product is developed. In this stage, a physical application system is constructed from the prototype and implementation work plans are developed. This stage is called the Development stage. A design document that contains the layout of the system and test plans is created and the final product of this stage is prototype. In this stage system’s data and process modelling is done using workshops. This stage is called the functional Design stage. At the end of this stage, it gives a clear picture of the information produced and a list of initial features is created based on this information. In this stage of Rapid Application Development, the development team discusses and prepares a high level requirement for the system. Security activity is discussed and the sensitivity of the information is also analyzed. An initial risk assessment is performed to determine the risks occurred during the transmission of user information. It defines the business functions and determines the system’s scope, objectives and functionality. This stage is called the Concept Definition stage. Rapid Application Development methodology includes the following four stages of development: Active user involvement throughout the Rapid Application Development lifecycle.Automating techniques and using time-boxed development process to make the development quicker. Choosing the right set of CASE tools to aid modelling, prototyping and code reusability.Workshops instead of interviews to gather requirements.Specify the correct sequence of tasks using the available tools and techniques.Rapid Application Development methodology includes the following important aspects: Essential Aspects of Rapid Application Development The Computer-Assisted Software Engineering (CASE) software offers developers to develop systems faster than that of the traditional systems irrespective of the programming language and the platform. Professor Clifford Kettemborough of Whitehead College, University of Redlands, defines Rapid Application Development as “an approach to building computer systems which combines Computer-Assisted Software Engineering (CASE) tools and techniques, user-driven prototyping, and stringent project delivery time limits into a potent, tested, reliable formula for top-notch quality and productivity.” Organizations need a faster, efficient and economical way to upgrade their existing systems and Rapid Application Development (RAD) lifecycle model is the best suitable option in such scenario. Thus these organizations are forced to change their legacy systems and build new applications, however traditional development lifecycles do not meet the expectations of today’s businesses due to their slow speed and time consuming nature. It becomes very difficult and challenging to change those systems today. In most of the organizations the information systems that were developed using programming languages and database systems are not documented properly. Rapid Application Development (RAD) is also considered as a complete approach to information systems development covering the entire lifecycle from the beginning to the end. James Martin defines the key objectives of Rapid Application Development (RAD) as: Rapid Application Development (RAD) model makes use of automated techniques and tools and replaces the manual design and development processes with the automated design and development that makes it less error prone than the manual coding. So, Rapid Application Development Lifecycle model refines the quality of the final product as well as reduces the time required to implement the system. Rapid Application Development (RAD) model is a development lifecycle model that offers quicker development of the project as the name suggests and yields higher quality results as compared to the traditional lifecycle models.
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