the spiral model is a risk-driven software development process model. these early papers use the term “process model” to refer to the spiral model as well as to incremental, waterfall, prototyping, and other approaches. thus, the incremental, waterfall, prototyping, and other process models are special cases of the spiral model that fit the risk patterns of certain projects. boehm illustrates each with an example of a “dangerous spiral look-alike” that violates the invariant. the waterfall model thus becomes a risk-driven special case of the spiral model.
as a result, the system is at risk of failing to satisfy their win conditions.  “hazardous spiral look-alikes” that violate this invariant include evolutionary processes that ignore risk due to scalability issues, and incremental processes that invest heavily in a technical architecture that must be redesigned or replaced to accommodate future increments of the product. boehm’s original description of the spiral model did not include any process milestones. “hazardous spiral look-alikes” that violate this invariant include evolutionary and incremental processes that commit significant resources to implementing a solution with a poorly defined architecture. these processes can result from following published approaches to object-oriented or structured software analysis and design, while neglecting other aspects of the project’s process needs.
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.
the spiral model is a risk-driven software development process model. based on the unique risk patterns of a given project, the spiral model is one of the most important software development life cycle models, which provides the software engineering team in spiral-sdlc spiral model is a risk-driven software development, . 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 spiral model is a combination of iterative development process model and sequential linear development model i.e. the the spiral model is a systems development lifecycle (sdlc) method used for risk management that combines the definition: the spiral model is similar to the incremental development for a system, with more emphasis placed on risk analysis. the spiral model has four phases: planning, design, construct and evaluation. a software project repeatedly passes through these phases in iterations (called spirals in this model).,
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