Iterative numerical algorithms are commonly used. Another example is to build neural networks by unrolling iterative reconstruction algorithms . There are various methods for numerical solution, such as the relaxation method, an iterative algorithm. The Unified Process is an iterative and incremental development process. SDLC can be described along a spectrum of agile to iterative to sequential methodologies. Many problems can be solved by both direct algorithms or iterative approaches. Modern calculators do not use iterative algorithms exclusively. DAD enables teams to make simplified process decisions around incremental and iterative solution delivery. Both iterative and direct methods exist for sparse matrix solving. Gamebryo's design emphasises a rapid prototyping approach aimed at an iterative development process. Scrum is a lightweight, iterative and incremental framework for managing complex work. These complexities are better handled with a more exploratory or iterative and incremental approach. In agile development, retrospectives play a very important role in iterative and incremental development. These large systems are generally solved using iterative methods. Preconditioners are usually used to accelerate convergence of iterative methods.