spiral model is one of the most important software development life cycle models, which provides support for risk handling. each loop of the spiral is called a phase of the software development process. as the project manager dynamically determines the number of phases, so the project manager has an important role to develop a product using spiral model. each phase of spiral model is divided into four quadrants as shown in the above figure. the most important feature of the spiral model is handling these unknown risks after the project has started. the spiral model supports coping up with risks by providing the scope to build a prototype at every phase of the software development.
prototyping model also support risk handling, but the risks must be identified completely before the start of the development work of the project. in each phase of the spiral model, the features of the product dated and analyzed and the risks at that point of time are identified and are resolved through prototyping. the spiral model is called as a meta model because it subsumes all the other sdlc models. the spiral model uses the approach of prototyping model by building a prototype at the start of each phase as a risk handling technique. also, the spiral model can be considered as supporting the evolutionary model – the iterations along the spiral can be considered as evolutionary levels through which the complete system is built. get hold of all the important cs theory concepts for sde interviews with the cs theory course at a student-friendly price and become industry ready.
this spiral model is a combination of iterative development process model and sequential linear development model i.e. the waterfall model with a very high emphasis on risk analysis. the spiral model has four phases. in the subsequent spirals as the product matures, identification of system requirements, subsystem requirements and unit requirements are all done in this phase. at the end of the spiral, the product is deployed in the identified market. the design phase starts with the conceptual design in the baseline spiral and involves architectural design, logical design of modules, physical product design and the final design in the subsequent spirals. in the baseline spiral, when the product is just thought of and the design is being developed a poc (proof of concept) is developed in this phase to get customer feedback.
these builds are sent to the customer for feedback. after testing the build, at the end of first iteration, the customer evaluates the software and provides feedback. the spiral model is widely used in the software industry as it is in sync with the natural development process of any product, i.e. the advantage of spiral lifecycle model is that it allows elements of the product to be added in, when they become available or known. this method is consistent with approaches that have multiple software builds and releases which allows making an orderly transition to a maintenance activity. another positive aspect of this method is that the spiral model forces an early user involvement in the system development effort. so, the discipline of change and the extent of taking change requests is very important to develop and deploy the product successfully.
spiral model is one of the most important software development life cycle models, which provides spiral model is a risk-driven software development process model. it is a combination of waterfall model and iterative model. spiral model helps to adopt software development elements of multiple process models for the software project based on unique risk patterns ensuring efficient development process. this spiral model is a combination of iterative development process model and sequential linear development model i.e. the waterfall model with a very high emphasis on risk analysis. it allows incremental releases of the product or incremental refinement through each iteration around the spiral., . the spiral model is a risk-driven software development process model. based on the unique risk patterns of a given project, the spiral model guides a team to adopt elements of one or more process models, such as incremental, waterfall, or evolutionary prototyping.
this definition of the spiral model explains what the systems development lifecycle the spiral model is used by the spiral model is a combination of sequential and prototype models. this model is best used for definition: the spiral model is similar to the incremental development for a after testing the build, at the end of first iteration, user evaluates the software and software is a model of the real world.,
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