Know about Software Development Life Cycle - Phases & Models

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Know about Software Development Life Cycle
Phases Models
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• Software Development Life Cycle
• The software development life cycle (SDLC) is a
  process used for structuring the development of
  any software system, from start through to
  implementation. This process aims to meet the
  customers demand for a fast turnaround.
  Understanding the concept of the software
  development life cycle (SDLC) is a great kick-off
  point towards planning any IT project.

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• Software Development Life Cycle(SDLC) Phases
• SDLC is considered to be the foundation for all
  software development methodologies, with various
  activities associated with each level. Activities
  such as budgets, requirements gathering, and
  documentation writing, are included in the cycle.
• Planning
• Requirements
• Design
• Development
• Testing

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• Planning
• In the planning phase, project goals are
  determined and a high-level plan for the intended
  project is established. Planning is the most
  fundamental and critical organizational phase.
  The three primary activities involved within the
  planning phase are as follows
• Identification of the system for development
• Feasibility assessment
• Creation of project plan

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• Requirements
• Discussing the requirements with stakeholders and
  industry experts is the first step of SDLC.
  Alternatively, business analysts can use the
  insights they received from customers. After this
  stage, everyone should have a clear picture of
  the scope of the project, budget, resources, and
  deadline, as well as possible risks and quality
  assurance requirements.

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• Design
• In the design phase, we describe the specified
  features and operations of the system. This phase
  includes business rules, pseudo-code, screen
  layouts, and other necessary documentation. The
  two primary activities involved within the design
  phase are as follows
• Designing of IT infrastructure
• Designing the system model

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• Development
• This phase is actually about the software under
  development. Following the defined development
  methodology. The main goal for Software
  developers, regardless of the picked methodology,
  is to produce working software as immediately as
  possible. Business owners should be regularly
  engaged as well to assure that the software meets
  their expectations.

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• Testing
• This phase allows the development team to see
  whether everything works as intended. This is the
  vital phase when they detect potential errors and
  see if the software meets the initial business
  goals. QA engineers design and carry out test
  cases and evaluate exit criteria. They create bug
  reports describing detected defects and report
  back to the stakeholders on the test findings and
  therefore the completion status.

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• SDLC Methodologies
• Agile Model
• With the Agile model, the whole development
  process is broken down into small timeboxes that
  minimize upfront planning. In this time, a
  cross-functional team works in all directions
  planning, analysis, design, coding, and testing.
  At the end of this iteration, a working product
  is presented to the stakeholders.

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• Waterfall Model
• The waterfall is the oldest and most
  straightforward methodology. Its all pretty much
  on the surface you complete a level, you go to
  the next one. The waterfall is a methodology that
  is the easiest to manage, however, it can be
  prone to delays. Due to its nature, every phase
  should be reviewed and signed off on before the
  team can start subsequent one.

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• Other Models
• Many other SDLC models are essentially a variant
  of these core processes. Organizations use LEAN
  manufacturing processes for software development.
  V-shaped development is a type of Waterfall that
  implements testing, verification, and validation.
  Spiral development may pick and choose models for
  every step within the development process.

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