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

Software development life cycle is not a new concept. We all use different software development methodologies to make our lives easier… For example, live streaming music, ride-hailing taxi, or location-based applications have significantly changed human behavior in a better way. But have you wondered how these apps came to be? How to turn your mobile app idea into reality?

Well, if you have, you need to understand Software Development Life Cycle or SDLC. It is an extremely useful tool for developing leaders who are required to undertake a robust software development process.

In this article, we will discover many kinds of software development life cycle models as well as their strengths and weaknesses. We will also provide you with a helpful guideline to determine when best to use each one of them.

But before getting into that, let’s first find out the basic process of a software development life cycle.

What are the Software Development Life Cycle (SDLC) Phases?

Generally, the software development life cycle is about breaking down your software development workflow into essential steps. Let’s understand what the steps of SDLC methodologies are through an example.

6 phases in SDLC model

Imagine if you need to have a mobile app built. This process would demand multiple steps. Then, a software development life cycle can be utilized to help a development team optimize their workflow, make it scalable and decent in quality at the same time.

  • This software development process guides you through the project from start to finish.
  • It highlights the weakest task or the greatest risk in your workflow.
  • If there is an involvement of other teams or stakeholders, their impact on timelines or approvals can be planned for.

It is an essence that any software engineer should have enough knowledge to choose the right software development life cycle models. To use it effectively, let’s see how SDLC can speed up the development process and even reduce costs!

Here are 6 steps in SDLC methodology:

1. Requirement analysis

At the first stage, all you need to do is about deciding what you’re going to develop. Should you develop for clients, spend time getting to know their needs, goals, and expectations towards the final product. During the first phase of software development life cycle, outline the following:

  • 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 the project and identify available resources.
  • Lastly, consider project opportunities and risks in each software development life cycle phase.

2. UI/UX Design

The second phase of the software development life cycle is determining which period the entire architecture of the future project is created. During the design phase, testers come up with a testing strategy suggesting what and how it needs to be tested.

  • 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.

For example, in website development, where functionality is limited, a design phase involves the creation of a very limited prototype before development begins.

3. Software Development

After all requirements analysis and design choices are already defined, the actual coding starts. In fact, this is the longest phase of the entire software development lifecycle.

But, you should consider how the project moves between different members of your team to avoid any dependencies (ex. front-end and back-end developers, web and mobile developers).

4. Testing and Quality Assurance

Once the code is fully created, testing is carried against the requirements. The testing phase of SDLC is about quality assurance. Testing also involves the checking of any faulty parts of the code and their fixes.

  • 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.

Even if having automated testing systems, nothing beats a good testing session by a dedicated QA team. So, get your testing team together, try out the product, log bugs, and generally push the code to breaking point. Afterward, send it back to the developers to fix it.

5. Deployment

After the software has been tested, the final deployment takes place. But, this is not as simple as the click of a button. There are a lot of things to consider in this software development life cycle process, including:

  • Who will give the final approval before launching?
  • 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

In the final phase of the SDLC, it’s important to acknowledge that all software requires maintenance. If users find any issues, the problem can be fixed in the next release.

It can be useful to plan for that, which includes:

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

6 Software Development Life Cycle Models

The product development life cycle models are often chosen depend on multiple factors. Be it the business requirements or time and budget available for the SDLC process.

But, there are many different ways you can actually approach, organize, and execute the development process. Don’t worry!

This article will answer all your questions about the models of software development life cycle available. Additionally, you will decide on the one that best fits the project at hand.

1. Agile software development life cycle


Up to date, Agile SDLC is one of the most popular software development models. With Agile development, the product is divided into small incremental builds and delivered in iterations. All tasks are divided into small time frames in order to prepare working functionality with each build. The final product built contains all the required features.


  • 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 change requirements
  • Identify minor issues before they can turn into bigger ones
  • Products penetrate to market faster
  • Better communication between users and product owners


  • Hard to predict what the final product will look like
  • Due to lack of documentation, the process quite challenging
  • High-risk probability when clients are unsure about requirements
  • Strict demands in terms of the scope to be done in time

Agile software development life cycle is designed for almost every type of project, but with a lot of customer engagement. Moreover, if your clients need some functionality to be done fast, Agile software development is a priority.


2. V-shaped SDLC Model

The V-Shaped model is an extension of the Waterfall SDLC approach. With the V-Model, the process is like flowing water. In other words, the development team does not move in a straight line but step by step after testing and coding.

Especially, early testing is typical for V-Model SDLC projects. There, every development stage has a parallel testing phase. And a team moves on to the next only after the previous stage is completed.


  • Easy to use and explain
  • Smooth tracking of potential defects
  • Offer simplicity, clear verification at every stage
  • Fit for small projects with understandable requirements
  • Save a lot of time as planning and designing related to testing which has been done 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

Just remember that V-Model are the same as in Waterfall. But the V-shaped SDLC model you cannot easily turn back a step to fix or add something.

If your software product is new, or you are not sure about the final functions, this model won’t work for you.

3. The Iterative approach

Instead of beginning with complete knowledge of requirements, the team develops a product in cycles, building small parts in an evolutionary way. In this case, a team only needs the requirements for the functional part. Subsequently, all requirements can be expanded upon later in the development process.

This model contains the steps from other SDLC models — analysis, design, coding, testing, and back to analysis. Unlike agile, the iterative model requires less customer involvement and has a pre-defined scope of increments. Yet it still shares the same goals as an agile model.


  • Identify functional or design flaws at the earliest stages
  • Each iteration is easy to evaluate
  • Allow more focus on user value
  • Provide space for flexibility like changing needs of the clients as well as the project
  • Decrease the delivery cost
  • Make the delivery of the end product faster


  • As incomplete requirements at the early stages, the design problems may occur
  • Require more time to take care tasks for management
  • May be hard to integrate resources if they aren’t planned in advance

As a result, the Iterative model works best for projects where major requirements are defined but some functionalities may evolve. Or, products with high-risk features that may need to be changed.

Besides, the process of this model should be used wisely. Otherwise, it may quickly drain the resources for unnecessary changes. Therefore, the iterative approach is not the best choice for startups with limited financial ability.

4. Spiral SDLC Model

The Spiral methodology is one of the most flexible SDLC models. The whole development process is divided into a lot of small phases for teams to follow.

Typically, it features the same phases as Waterfall in the same order such as requirements gathering, design, implementation, and testing.


  • Estimate new changes at the later stage of the development
  • If the prototyping is done in small increments, cost estimation becomes easier
  • Easier to detect 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

In response, the Spiral methodology works best for complicated projects with small functionality or strict budgets. It is also suitable for projects with no clear requirements at the early stages, or with requirements that need to be evaluated.

5. Waterfall SDLC Methodologies


In the Waterfall model, tasks and phases are completed one by one in a strict order. You need to finish one phase before moving to another one. Plus, there is no going back. And every stage depends on the previous one.


  • Easy to manage for the team
  • Simple 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 the Agile model, it takes more time to make the final delivery
  • Difficult to measure client needs in terms of a functional specification during the requirement phase

To sum up, this SDLC model is easy to manage a stable and clear definition of the product. But the fact that there is almost no room for revisions once a stage is finished, fixing any problems is quite a challenge.

Traditional SDLC vs Agile SDLC

Agile or Waterfall? Which methodology is right for your project?

Agile software development is built on adapting to flexible requirements and satisfying users and clients by delivering working software early. While traditional software development life cycle like Waterfall, V-shaped, Iterative and Spiral models all belong to the predictive approach.

In the nutshell, all of them are designed to sacrifice the development requirements and expectations. But how to choose the right software development life cycle for your company? Which work will deliver the most value to your clients?

Both software development life cycle models have pros and cons. However, the Waterfall model implies challenges to projects that lack time and resources for implementation and support.

On the other hand, the Agile SDLC model is well-known for its flexibility. Changes can be made at any stage of the development process.

Explore more: Traditional vs Agile SDLC: How To Skyrocket Your Project With Agile Model

Below, you can see a comparison table that explains where it is better to use the Agile SDLC model and what projects would benefit from the traditional SDLC methodology.


6. Big bang model SDLC

The big bang methodology follows no specific process, and very little time is spent on planning. Needs are understood as the process moves forward. Any required changes may or may not need to improve the complete software.


  • Ability to begin coding immediately
  • Work well for introducing new comers to the main pillars of software development
  • No need to managerial staff


  • Not ideal for complex project
  • Extremely high level of risk involved
  • Potential for increased cost

As a result, the big bang model works best at honing the skills of full-stack or multi-disciplined developers. This software development life cycle also suits small-scale projects. Especially, it shines during Hackathons, which refers to organized events where collaborators gather for a few days to quickly develop functional software.


Which software development life cycle is suitable for your coming project?

Choosing the right SDLC methodology to develop any kind of software is very important. If you make the wrong choice, the entire process will step back or even end up as an irrecoverable project. Therefore, choose them wisely!

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