Top 6 Software Development Life Cycle (SDLC) Models & Methodologies

software development life cycle SDLC software development methodology software development process software development model

What are Software Development Life Cycle (SDLC) Phases?

SDLC Methodologies

  • This software development process guides you through the project from start to finish.
  • It highlights where your workflow is weakest or where the greatest risks lie.
  • If the involvement of other teams or stakeholders is required, their impact on timelines or approvals can be planned for.
software development life cycle stages SDLC phase

1. Requirement analysis

  • Answer questions such as: How will the software be used? Who is going to use the software?
  • Next, analyze those requirements for feasibility and validity: cost, performance, functionality.
  • Then, evaluate the scope of project and identify available resources.
  • Lastly, consider project opportunities and risks in each software development life cycle phase.

2. UI/UX Design

  • Every required component specifies systems architecture, configurations, data structure.
  • Desired output including prototypes, pseudocode.
  • Design details like the functional logic, interface details, dependency issues, and errors.

3. Software Development

4. Testing and Quality Assurance

  • Develop a test plan based on the predefined software requirements.
  • Identify the resources available for testing such as instructions and assignments for testers, selects types of tests and reports to technical executives.
  • Work collectively with development teams to improve test results.

5. Deployment

  • Who will give the final approval before launch?
  • Do you launch it to everyone in production or selected users?
  • If there are issues with the deployment, what will you do next?

6. Maintenance

  • How often maintenance is required?
  • What the maintenance process looks like?
  • What to do if a product has a bug?

Software Development Life Cycle Models

Agile software development life cycle

agile software development life cycle agile software development
  • Provided flexibility to promote the development of software in small, quick steps
  • Release updates to users more frequently based on continuous iterations
  • Highly adaptive to changing requirements
  • Identify minor issues before they can evolve into bigger ones
  • Products get to market faster
  • Better communication between users and product owners
  • Hard to predict what the final product will look like
  • Due to lack of documentations, the process quite challenging
  • High-risk probability when clients unsure about requirements
  • Strict demands in terms of the scope to be done in time

Traditional SDLC vs Agile SDLC

Traditional software development life cycle

  • Easy to use and explain
  • Smooth tracking of potential defects
  • Offer simplicity, clear verification at every stage
  • Fit for small projects with understandable requirements
  • Saves a lot of time as planning and designing related to testing is done way before the actual coding takes place
  • Less flexible than the Waterfall model with no support for iterations
  • No early prototype available during the implementation phase
  • Hard to make adjustments due to no handling of parallel
  • Identify functional or design flaws at the earliest stages
  • Each iteration is easy to evaluate
  • Allows more focus on user value
  • Provide space for flexibility like changing needs of the clients as well as the project
  • Lower the delivery cost
  • Make the delivery of the end product speedier
  • As incomplete requirements at the early stages, the design problems may occur
  • Demands added management attention
  • May be hard to integrate resources if they aren’t planned in advance
  • Estimate new changes at a later stage of the development
  • If the prototyping is done in small increments, cost estimation becomes easier
  • Higher quality of risk at each phase
  • Faster involvement of the development team and users
  • High risk of management due to not meeting budget or schedule deadlines
  • More money and time required to get the finished product

Waterfall vs Agile SDLC

waterfall vs traditional software development life cycle model
  • Easy to manage for the team
  • Easy to explain to the clients
  • Plan and schedule with clear milestones
  • Errors are easy to verify at each stage
  • Technical documentation is easy to understand
  • Inflexibility
  • High risk of bugs
  • Compared to Agile model, take more time to make the final delivery
  • Difficult to measure client needs in terms of a functional specification during the requirements phase



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