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Some people consider a life-cycle “model” a more general term for a category of methodologies and a software development “process” a more specific term to refer to a specific process chosen by a specific organization. For example, there are many specific software development processes that fit the spiral life-cycle model. Methodologies, processes, and frameworks range from specific proscriptive steps that can be used directly by an organization in day-to-day work, to flexible frameworks that an organization uses to generate a custom set of steps tailored to the needs of a specific project or group. In some cases a “sponsor” or “maintenance” organization distributes an official set of documents that describe the process. PANDATA, the first English translation was published in 1974.
Since the early 2000s scaling agile delivery processes has become the biggest challenge for teams using agile processes. Attempts to reduce inherent project risk by breaking a project into smaller segments and providing more ease-of-change during the development process. The client is involved throughout the development process, which increases the likelihood of client acceptance of the final implementation. While some prototypes are developed with the expectation that they will be discarded, it is possible in some cases to evolve from prototype to working system. A basic understanding of the fundamental business problem is necessary to avoid solving the wrong problems, but this is true for all software methodologies. Various methods are acceptable for combining linear and iterative systems development methodologies, with the primary objective of each being to reduce inherent project risk by breaking a project into smaller segments and providing more ease-of-change during the development process.
The initial software concept, requirements analysis, and design of architecture and system core are defined via Waterfall, followed by incremental implementation, which culminates in installing the final version, a working system. The “planning” of software developed using RAD is interleaved with writing the software itself. The lack of extensive pre-planning generally allows software to be written much faster, and makes it easier to change requirements. In the next stage, requirements are verified using prototyping, eventually to refine the data and process models.
Key objective is for fast development and delivery of a high quality system at a relatively low investment cost. Key emphasis is on fulfilling the business need, while technological or engineering excellence is of lesser importance. If the project starts to slip, emphasis is on reducing requirements to fit the timebox, not in increasing the deadline. Active user involvement is imperative.