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Iterative and incremental development is any combination of both iterative design (or iterative method) and incremental build model for development. 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.
In contrast, phyletic gradualism (below), is a more gradual, continuous model of evolution – with accumulation of small incremental changes represented by slanted bars that split at branch-points, where two separate modes of life are feasible but of which, each prospers best with divergent specializations.
Evolutionary design, continuous design, evolutive design, incremental design or evolutionary architecture is directly related to any modular design application, in which components can be freely substituted to improve the design, modify performance, or change another feature at a later time.
The spiral model is a risk-driven software development process model. Based on the unique risk patterns of a given project, the spiral model guides a team to adopt elements of one or more process models, such as incremental, waterfall, or evolutionary prototyping.
A life-cycle "model" is sometimes considered a more general term for a category of methodologies and a software development "process" is a particular instance as adopted by a specific organization. [ citation needed ] For example, many specific software development processes fit the spiral life-cycle model.
The incremental philosophy is also used in the agile process model (see agile modeling). [2] [1]: Section 2.3.3 The Incremental model can be applied to DevOps. DevOps centers around the idea of minimizing the risk and cost of a DevOps adoption whilst building the necessary in-house skillset and momentum. [3] Characteristics of Incremental Model
Staged model was introduced to replace conventional analysis which is less suitable for modern software development is rapid changing due to its difficulties of hard to contribute in software evolution. There are five distinct stages contribute in simple staged model (Initial development, Evolution, Servicing, Phase-out, and Close-down).
Phyletic gradualism is a model of evolution which theorizes that most speciation is slow, uniform and gradual. [3] When evolution occurs in this mode, it is usually by the steady transformation of a whole species into a new one (through a process called anagenesis).