Spiral model

The spiral model is a process model in software development, which was described in 1986 by Barry W. Boehm. It is a generic process model and therefore open to existing process models. Management can always intervene, as you spiral progress develops.

Description

The spiral model summarizes the development process in software engineering as an iterative process, each cycle in each quadrant contains the following activities:

The risk assessment is the essential aspect that distinguishes the spiral model of other, previously developed process models. Initially, all risks that threaten the project have identified and then evaluated. We search for a way to eliminate the greatest risk. The project is considered to have failed if the removal fails. In contrast, if there are no more risks, the project has been successfully completed.

The spiral model is one of the incremental or iterative process models. It is an evolution of the waterfall model, in which the phases are repeated several times in a spiral.

The incremental and iterative process model thus provides a cyclic repetition of the individual phases. In this case, the project slowly approaches to the goals, even if the goals change during the project progress. With the spiral model the risk of failure is significantly reduced in large software projects according to Boehm.