Uncategorized software development life cycle (SDLC) – TechTarget
The software development life cycle (SDLC) is a framework used in project management to describe the stages and tasks involved in each step of writing and deploying the instructions and data computers use to execute specific tasks. An SDLC model maps the complete software development process from its initial planning through maintenance and eventual retirement and replacement of the completed application.
An important goal of the SDLC is to quickly and efficiently produce high-quality software in a series of phases that are called steps. The number of steps in an SDLC will vary depending on the business and its software product goals. For example, at the most basic level, software is designed, developed, tested and then released. Upon release, the software is maintained until it is discontinued. Typically, there will be between five and seven steps—although there can be more.
In general, the SDLC process follows these phases:
Other organizations may include steps for deconstructing, retiring and replacing software as well.
There are a myriad of various SDLC models to choose from when developing software, and the right one depends on the requirements of any given project. Several models can be combined into a hybrid methodology. Documentation is crucial, regardless of the type of SDLC model for a given application, and is usually done in parallel with the development process.
For example, the waterfall model is a linear, sequential approach to the software development life cycle (SDLC) that emphasizes a logical progression of steps. Similar to the way water creates a waterfall by flowing down a creek and over a cliff, once development work in a waterfall model has been completed, it cannot be revisited. The term is often associated with large, monolithic software products developed before the turn of the century. Most developers do not develop code with waterfall now since it is considered unrealistic to finish a piece of code, and not revisit it.
In contrast, the Agile model for SDLC is a more modular and flexible approach. Agile approaches software development in incremental cycles, called sprints. Each sprint is iterative and code is designed to be modular.
Other popular SDLC models include:
Benefits that come with a well-defined SDLC include:
However, if used less optimally, SDLC can come with hindrances such as:
Many advantages are specific to the specific model chosen. To better represent advantages and disadvantages in this way, we can use both waterfall and agile models to compare. Waterfall and agile are often compared SDLC models, as they were the most widely used at different points in time. Waterfall methods have the advantage of being easy to understand, well defined and easy to verify each phase. The waterfall model can also be used in small development teams. However, the waterfall model does not allow for the start of the next phase until the previous one is finished, is not suitable for long term projects and can get expensive if any changes are needed.
Meanwhile, agile enables flexibility, while each iteration is separated by sprints and is well suited for both long and short term projects. However, agile is high in development cost, needs skilled teams, and can be exhausting for teams to work on sprints.
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