6 Basic SDLC Methodologies: Which One Is Best?

Furthermore, developers will often create a software requirement specification or SRS document. During this step, current priorities that would be affected and how they should be handled are considered. A feasibility study determines whether creating a new or improved system is appropriate. This helps to estimate costs, benefits, resource requirements, and specific user needs. Agile methodology is a practice which promotes continue interaction of development and testing during the SDLC process of any project.

system development life cycle sdlc

The planning phase helps delineate all subsequent tasks so they can be planned and budgeted for accordingly. In general, SDLC is a closed loop in which each stage affects the actions in subsequent ones and provides clear information for future stages. To answer specific questions and ensure consistency in your development process, usually, all six stages try to effectively and consistently influence each other. Unlike the spiral SDLC methodology (which is similar in concept), the iterative incremental model deploys each software version to production. The iterative incremental model requires the team to quickly deploy an incomplete version of the software at the end of each development cycle.

Steps in SDLC

The risk assessment methodology is largely performed during this phase, providing early security perspectives to the project team. Even more rigid is the related Verification and Validation model — or V-shaped model. It’s characterized by a corresponding testing phase for each development stage.

system development life cycle sdlc

This model is suited for small teams who work to produce a set of features within fixed-time interactions, such as two- to four weeks, called sprints. Let’s walk through the four key elements of a Scrum model as depicted in Fig 10.4. Defect checking tools should be used to monitor and track identified defects during all testing phases. https://www.globalcloudteam.com/ This provides the basis for making informed decisions regarding the status and resolution of any defects. With little room for revisions once a stage is completed, problems can’t be fixed until you get to the maintenance stage. This model doesn’t work well if flexibility is needed or if the project is long-term and ongoing.


Testing will be conducted until the end-user finds it acceptable according to standards. Another part of this stage is validation and verification—and both are done to help ensure the successful completion of the project. This procedure where the care is taken for the developed product is known as maintenance. Mostly used for creating and delivering a wide range of ideas, this model perfectly fits the clients that don’t have a clear idea or vision of how their final product should look like. This process involves detecting the possible bugs, defects, and errors, searching for the various vulnerabilities, etc, and can sometimes take up even more time compared to the app-building stage. As a rule, these features help to finalize the SRS document as well as create the first prototype of the software to get the overall idea of how it should look like.

system development life cycle sdlc

The SDLC stages in the waterfall go one after another in a sequential
manner. It means that a development team can proceed to the next stage only after the
previous one is complete. Develop detailed design specifications that translate functional specifications into a logical and physical design. Detailed design specifications are developed during the design phase of the SDLC and describe how the system or application is designed to satisfy the requirements documented in the functional specifications. Ideally, System Analysts are highly skilled and knowledgeable in multiple operating systems, hardware configurations, programming languages, and software and hardware platforms.

Feasibility Study or Planning

Through maintenance efforts, the team can add new capabilities and features and meet new requirements set by the client. The second SDLC phase is where teams will work on the root of their problem or need for a change. In case there’s a problem to solve, possible solutions are submitted and analyzed to figure out the best fit for the project’s ultimate goal or goals. The main purpose of this step is to identify the scope of the problem and come up with different solutions. Some of the things to consider here include costs, benefits, time, resources, and so on. This is the most crucial step because it sets the tone for the project’s overall success.

Vulnerabilities may seem small on their own, but when tied together in an attack path, they can cause severe damage. Our red team models how a real-world adversary might attack a system, and how that system would hold up under attack. The release phase involves the team packaging, managing and deploying releases across different environments.

Software Requirement

This SDLC model is documentation-intensive, with earlier phases documenting what need be performed in the subsequent phases. Lack of control over the system changes due to a working version’s fast turn-around to address users’ issues. At Svitla Systems, we have expert teams of specialists who are knowledgeable in all the major SDLC methodologies, as well as the latest and most successful methods to help you build a powerful information system. The project is as good as it is thoroughly tested, which is why the tester’s role is critical in any SDLC effort. Testers test the software and validate that it’s behaving as intended as well as approving the beta version release once it’s properly tested and retested. One thing to note about the v-model is that no phase can start until the previous one is completed including a corresponding testing exercise.

  • Developers must follow the coding guidelines defined by their organization and programming tools like compilers, interpreters, debuggers, etc. are used to generate the code.
  • Typically, the more steps defined in an SDLC model, the more granular the stages are.
  • Over time, structured programming demanded more tactical development models, thus sparking the beginnings of the SDLC.
  • Relevant questions include whether the newly implemented system meets requirements and achieves project goals, whether the system is usable, reliable/available, properly scaled and fault-tolerant.
  • In this type of SDLC model testing and the development, the phase is planned in parallel.
  • Most teams rely on automated tests to speed up this phase, but some manual examinations are also valuable (penetration tests are a good example).
  • Before embarking on a new project, it’s important to identify how the SDLC will cover and satisfy the overall requirements to deliver the best results.

It transforms user needs and functional specifications into a detailed technical plan that guides the development team. Proper system design ensures that the developed system aligns with the desired functionality, performance, and scalability requirements. In general, SDLC in information systems is defined by a model and described in the form of a methodology. The life cycle model or paradigm defines the overall organization and, as a rule, its main phases and principles of transition between them. The methodology or method determines the set of actions, their detailed content, and the roles/responsibilities of specialists at all stages of the selected software development model. The Agile methodology can work in harmony with the SDLC process by pairing phases with iteration frameworks.

Vulnerability management, its impact and threat modeling methodologies

To that end, using the SDLC process goes a long way in compartmentalizing and breaking down robust tasks, into smaller, more manageable tasks that are easier to measure and achieve. Thanks to its framework of structured phases, those involved in the SDLC can help shape the project and manage it in a more streamlined fashion. Kellton brings the in-depth expertise of the leading software development practices aligned with the agile development approach, enabling businesses to make the right decisions.

The agile methodology relies on ongoing release cycles that make small, incremental changes to the previous release. Builds evolve as teams add new features and improvements with each deployment. Each iteration goes through verification and requires either user or stakeholder feedback. The last iteration deploys a product version that went through rigorous testing and meets all the requirements specified in the DDS. While time-consuming, prototyping is much less expensive than making radical changes after the development phase. How the SDLC will cover and satisfy overall requirements should be determined before embarking on a new project so you can achieve the best results.

Initiation Phase

SDLC is not an isolated process, in fact, there are many methodologies available that are paired successfully to meet unique project needs. Each methodology has its distinctive collection of pros and cons that should be weighed down to decide which system development life cycle aspect or trait will yield the best results for an SDLC project. A quick guide on each of the key features of Mission Control’s project management platform. Browse through all our recent articles on business, technology and project management.

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