Usage of the term began in software development, with a long-standing combination of the two terms iterative and incremental[1] having been widely suggested for large development efforts. For example, the 1985 DOD-STD-2167[2]mentions (in section 4.1.2): "During software development, more than one iteration of the software development cycle may be in progress at the same time." and "This process may be described as an 'evolutionary acquisition' or 'incremental build' approach." In software, the relationship between iterations and increments is determined by the overall software development process.
The Unified Software Development Process Ebook Pdf 47
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The basic idea behind this method is to develop a system through repeated cycles (iterative) and in smaller portions at a time (incremental), allowing software developers to take advantage of what was learned during development of earlier parts or versions of the system. Learning comes from both the development and use of the system, where possible key steps in the process start with a simple implementation of a subset of the software requirements and iteratively enhance the evolving versions until the full system is implemented. At each iteration, design modifications are made and new functional capabilities are added.[3]
Recent revisions to DoDI 5000.02 no longer refer to "spiral development," but do advocate the general approach as a baseline for software-intensive development/procurement programs.[5] In addition, the United States Agency for International Development (USAID) also employs an iterative and incremental developmental approach to its programming cycle to design, monitor, evaluate, learn and adapt international development projects with a project management approach that focuses on incorporating collaboration, learning, and adaptation strategies to iterate and adapt programming.[6]
While the term iterative and incremental development got started in the software industry, many hardware and embedded software development efforts are using iterative and incremental techniques.
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