Spiral Model Software Engineering. When viewed as a diagram, the spiral model looks like. The initial phase of the spiral model is the early stages of waterfall life cycle that are needed to develop a software product.
A strict waterfall approach discourages revisiting and revising any prior phase once it is complete. Spiral model with introduction, software development life cycle, design, development, testing, quality assurance, quality control, methods, black box testing, white box testing, etc. The spiral model is a combination of an iterative development process model and a sequential linear development model.
