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SDLC Overview: Software Development Lifecycle Model

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Evaluate different systems lifecycle models.
SDLC Overview
SDLC, Software Development Life Cycle is a process used by software industry to design, develop and test high quality softwares. The SDLC aims to produce high quality software that meets or exceeds customer expectations, reaches completion within times and cost estimates.
• SDLC is the acronym of Software Development Life Cycle.
• It is also called as Software development process.
• The software development life cycle (SDLC) is a framework defining tasks performed at each step in the software development process.
• ISO/IEC 12207 is an international standard for software life-cycle processes. It aims to be the standard that defines all the tasks required for developing …show more content…

Some situations where the use of Waterfall model is most appropriate are:
• Requirements are very well documented, clear and fixed.
• Product definition is stable.
• Technology is understood and is not dynamic.
• There are no ambiguous requirements.
• Ample resources with required expertise are available to support the product.
• The project is short.
Waterfall Model Pros & Cons
Advantage
The advantage of waterfall development is that it allows for departmentalization and control. A schedule can be set with deadlines for each stage of development and a product can proceed through the development process model phases one by one.
Development moves from concept, through design, implementation, testing, installation, troubleshooting, and ends up at operation and maintenance. Each phase of development proceeds in strict order.
Disadvantage
The disadvantage of waterfall development is that it does not allow for much reflection or revision. Once an application is in the testing stage, it is very difficult to go back and change something that was not well-documented or thought upon in the concept …show more content…

This model is most often used in the following scenarios:
• Requirements of the complete system are clearly defined and understood.
• Major requirements must be defined; however, some functionalities or requested enhancements may evolve with time.
• There is a time to the market constraint.
• A new technology is being used and is being learnt by the development team while working on the project.
• Resources with needed skill set are not available and are planned to be used on contract basis for specific iterations.
• There are some high risk features and goals which may change in the future.

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SDLC Spiral Model
The spiral model has four phases. A software project repeatedly passes through these phases in iterations called Spirals.

• Identification: This phase starts with gathering the business requirements in the baseline spiral. In the subsequent spirals as the product matures, identification of system requirements, subsystem requirements and unit requirements are all done in this

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