ABSTRACT
The most common models include the waterfall model, the V-model, the spiral model, the walking skeleton model, and others, many of which originated in the software development industry. The waterfall model, known as the linear-sequential life cycle model, breaks down the systems engineering (SE) development process into linear sequential phases that do not overlap one another. The V-model, or the verification and validation model, is an enhanced version of the waterfall model that illustrates the various stages of the system life cycle. The spiral model is similar to the V-model in that it references many of the same phases as part of its color coordinated slices, which indicates the project’s stage of development. The spiral model requires the life cycle process to be completed, the Defense Acquisition University model can refine and improve products at any point in its phase progression. Object-oriented analysis and design is an Agile Methodology approach toward SE, and eschews traditional systems design processes.
