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A number of SDLC models have been created, including waterfall, fountain, spiral, build and fix, rapid prototyping, incremental, synchronize, and stabilize.In the following diagram, these stages of the systems development life cycle are divided in ten steps, from definition to creation and modification of IT work products: Not every project will require that the phases be sequentially executed. Depending upon the size and complexity of the project, phases may be combined or may overlap. During this step, consider all current priorities that would be affected and how they should be handled.
The output of this stage will describe the new system as a collection of modules or subsystems.
The design stage takes as its initial input the requirements identified in the approved requirements document.
These methodologies are obviously quite different approaches, yet they both contain the SDLC phases in which a requirement is born, then travels through the life cycle phases ending in the final phase of maintenance and support, after-which (typically) the whole life cycle starts again for a subsequent version of the software application.
The product life cycle describes the process for building information systems in a very deliberate, structured and methodical way, reiterating each stage of the product's life.
In the Scrum methodology, for example, one could say a single user story goes through all the phases of the SDLC within a single two-week sprint.
Contrast this to the waterfall methodology, as another example, where every business requirement (recorded in the analysis phase of the SDLC in a document called the Business Requirements Specification) is translated into feature/functional descriptions (recorded in the design phase in a document called the Functional Specification) which are then all built in one go as a collection of solution features typically over a period of three to nine months, or more.
In systems engineering, information systems and software engineering, the systems development life cycle (SDLC), also referred to as the application development life-cycle, is a process for planning, creating, testing, and deploying an information system.
A systems development life cycle is composed of a number of clearly defined and distinct work phases which are used by systems engineers and systems developers to plan for, design, build, test, and deliver information systems.
The systems development life cycle, according to Elliott & Strachan & Radford (2004), "originated in the 1960s, to develop large scale functional business systems in an age of large scale business conglomerates.
Information systems activities revolved around heavy data processing and number crunching routines".