Software Development Life-Cycle (SDLC)

Posted By on April 24, 2016


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Introduction to Software Engineering
Software Development Process Models
  • Software life cycle models describe phases of the software cycle and the order in which those phases are executed.
  • Each phase produces deliverable required by the next phase in the life cycle.
  • Requirements are translated into design.
  • Code is produced according to the design which is called development phase.
  • After coding and development the testing verifies the deliverable of the implementation phase against requirements.

There are following six phases in every Software development life cycle model:

  1. Requirement gathering and analysis
  2. Design
  3. Implementation or coding
  4. Testing
  5. Deployment
  6. Maintenance

Software Development Life Cycle (SDLC)

1) Requirement gathering and analysis:

  • Business requirements are gathered in this phase.
  • This phase is the main focus of the project managers and stake holders.
  • Meetings with managers, stake holders and users are held in order to determine the requirements like;
    • Who is going to use the system?
    • How will they use the system?
    • What data should be input into the system?
    • What data should be output by the system?
  • These are general questions that get answered during a requirements gathering phase.
  • After requirement gathering these requirements are analyzed for their validity and the possibility of incorporating the requirements in the system to be development is also studied.
  • Finally, a Requirement Specification document is created which serves the purpose of guideline for the next phase of the model.

2)  Design:

  • In this phase the system and software design is prepared from the requirement specifications which were studied in the first phase.
  • System Design helps in specifying hardware and system requirements and also helps in defining overall system architecture.
  • The system design specifications serve as input for the next phase of the model.
  • In this phase the testers comes up with the Test strategy, where they mention what to test, how to test.

3)  Implementation / Coding:

  • On receiving system design documents, the work is divided in modules/units and actual coding is started.
  • Since, in this phase the code is produced so it is the main focus for the developer.
  • This is the longest phase of the software development life cycle.

4)  Testing:

  • After the code is developed it is tested against the requirements to make sure that the product is actually solving the needs addressed and gathered during the requirements phase.
  • During this phase all types of functional testing like unit testing, integration testing, system testing, acceptance testing are done as well as non-functional testing are also done.

5)  Deployment:

  • After successful testing the product is delivered / deployed to the customer for their use.
  • As soon as the product is given to the customers they will first do the beta testing.
  • If any changes are required or if any bugs are caught, then they will report it to the engineering team.
  • Once those changes are made or the bugs are fixed then the final deployment will happen.

6) Maintenance:

  • Once when the customers starts using the developed system then the actual problems comes up and needs to be solved from time to time.
  • This process where the care is taken for the developed product is known as maintenance.
Introduction to Software Engineering
Software Development Process Models

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Posted by Akash Kurup

Founder and C.E.O, World4Engineers Educationist and Entrepreneur by passion. Orator and blogger by hobby

Website: http://world4engineers.com