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Information system methodologies…
http://en.wikipedia.org/wiki/Software_development_process
In software engineering, a software development methodology (also known as a system development methodology,software development life cycle, software development process, software process) is a division of software developmentwork into distinct phases or activities with the intent of better planning and management. It is often considered a subset of thesystems development life cycle. The methodology may include the pre-definition of specific deliverables and artifacts that are created and completed by a project team to develop or maintain an application.[1] Common methodologies include waterfall, prototyping, iterative and incremental development, spiral development, rapid application development, and extreme programming. 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.

Waterfall development[edit]
Main article: Waterfall model

The activities of the software development process represented in the waterfall model. There are several other models to represent this process. The waterfall model is a sequential development approach, in which development is seen as flowing steadily downwards (like a waterfall) through several phases, typically: Requirements analysis resulting in a software requirements specification Software design

Implementation
Testing
Integration, if there are multiple subsystems
Deployment (or Installation)
Maintenance
The first formal description of the method is often cited as an article published by Winston W. Royce[3] in 1970 although Royce did not use the term "waterfall" in this article. The basic principles are:[1] Project is divided into sequential phases, with some overlap and splashback acceptable between phases. Emphasis is on planning, time schedules, target dates, budgets and implementation of an entire system at one time. Tight control is maintained over the life of the project via extensive written documentation, formal reviews, and approval/signoff by the user and information technology management occurring at the end of most phases before beginning the next phase. The waterfall model is a traditional engineering approach applied to software engineering. A strict waterfall approach discourages revisiting and revising any prior phase once it is complete. This "inflexibility" in a pure waterfall model has been a source of criticism by supporters of other more "flexible" models. It has been widely blamed for several large-scale government projects running over budget, over time and sometimes failing to deliver on requirements due to the Big Design Up Front approach. Except when contractually required, the waterfall model has been largely superseded by more flexible and versatile methodologies developed specifically for software development. See Criticism of Waterfall model. The waterfall model is also commonly taught with the mnemonic A Dance in the Dark Every Monday, representing Analysis, Design, Implementation, Testing, Documentation and Execution, and Maintenance.[citation needed] Requirements analysis in systems engineering and software engineering, encompasses those tasks that go into determining the needs or conditions to meet for a new or altered product, taking account of the possibly conflictingrequirements of the various stakeholders, analyzing, documenting, validating and managing software or system requirements.[2] Requirements analysis is critical to the success of a systems or software project.[3] The requirements should be documented, actionable, measurable, testable, traceable, related to identified business needs or opportunities, and defined to a level of detail sufficient for system design....
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