To ensure development modules are checked for quality, each stage is done repeatedly until the product is deemed satisfactory. Each iteration of this pre-production process ensures that the product will be functional and meets requirements throughout. The iterative model working is a process that is used to consistently design, develop, and test software. It is used in software projects where the development team works in iteration on successive versions of the same system by adding new functional capabilities on each iteration. The iterative model of Software Testing is a software development methodology for rapid prototyping and building software products.