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Other SDLC Methodologies

 

SDLC stands for Software Development Life Cycle. It is a process used by the IT industry to design, develop and test software.

It ensures that software is developed in a cost effective way, within planned schedule and with the highest quality.

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SDLC Steps and Best Practices :

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  • Identify the software requirements : Define the requirements based on business input.

  • Plan : Plan the project including resources, budget and schedule.

  • Design : Design the solution and provide a design document as output.

  • Build : Development of the solution based on the design document created in previous step.

  • Test : Testing of the solution and fixing of all defects/bugs.

  • Deploy : Execute the deployment activities and deploy the application to the production environment.

  • Maintain : This includes, applying fixes, implementing change requests and updating the software and the environment itself.

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Example of SDLC Methodologies :

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  • Waterfall :

    This is the oldest and most straightforward SDLC methodology. A phase start only after the previous phase has finished. Each stage relies on the information of the previous stage. Each stage has its own mini-plan.

    + Advantages : This methodology is very simple to plan and manage.
    -  Disadvantages : Is not well suited to accommodate unplanned events or changes.

     

  • Agile :

    This is a very popular SDLC methodology, especially for very complex projects. With the Agile methodology, software is developed in incremental, rapid cycles. This requires intensive interactions between all project stakeholders and requires business feedback throughout the development process.

    + Advantages : The main advantage is that the test results are available after each cycle.
    -  Disadvantages : The significant increase of communication between all project stakeholders.

     

  • Iterative :

    This model emphasizes repetition. Project teams implement a version of the software, then test, evaluate and pinpoint further requirements. A new version is created with each phase/iteration. This process repeats until the software is completed.

    + Advantages : Produces a working version of the project early in the process. Changes are therefore less expensive.
    -  Disadvantages : Can consume resources very quickly if left unchecked.

     

  • Spiral :

    One of the most flexible SDLC methodology. Is similar to the iterative methodology in its repetition model.
    The spiral methodology passes through four phases (planning, risk analysis, engineering and evaluation) over and over with gradual improvements at each pass until completion.

    + Advantages : Continuous or repeated development helps in risk management.
    -  Disadvantages : Not suited for small projects.

     

  • DevOps :

    This relatively new methodology emerged from the application of Agile and Lean methodologies to operations work and the necessity of collaboration between the development and operation teams at all stages of the SDLC process.
    In the DevOps methodology, developers and operations teams work closely together.

    + Advantages : Acceleration of innovation and the deployment of higher quality and more reliable software.
    -  Disadvantages : Difficulty to find the appropriate resources as this is still a very new area with a lack of experienced professionals.

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