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Software Development Life Cycle SDLC Phases and Models

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As its name suggests, this methodology is graphically presented as a cascading set of steps and actually works as a pipeline for software development. Due to such lack of flexibility, this SDLC results in a lot of waste and rework, so it is rarely used in modern IT companies. This need for greater software security comes at a time when there is tremendous pressure on developers to build better applications faster than ever andmodernize those appsfaster, too.. As a result, development teams are turning to more agile processes to further streamline workflows and reduce time to market.

definition of software life cycle model

The first step in waterfall is gathering all the customer requirements up front. This is the only stage that involves customers until the software is delivered. Maintenance can be considered the most extensive part of the SDLC since the lion’s share of resources is spent to support the product after it has already been developed. To notice any malfunctions in the system and immediately neutralize them, it is necessary to monitor its vitals in real-time.


Systems analysis and design can be considered a meta-development activity, which serves to set the stage and bound the problem. SAD interacts with distributed enterprise architecture, enterprise I.T. This high-level description is then broken down into the components and modules which can be analyzed, designed, and constructed separately and integrated to accomplish the business goal. SDLC and SAD are cornerstones of full life cycle product and system planning. SDLC is not a methodology per se, but rather a description of the phases that a methodology should address. The list of phases is not definitive, but typically includes planning, analysis, design, build, test, implement, and maintenance/support.

  • A high flexibility level makes a development process adaptable to dynamic market conditions, ensuring that a client will get a relevant product in the end.
  • Thus, this life cycle approach is incredibly adaptive since it emphasizes the adaptive process, not planning.
  • The model adds flexibility to the development and allows altering the plan as you go.
  • Instead, the emphasis is on finding the balance between quality and speed.
  • Software Development Life Cycle is a process of developing, modifying, maintaining, and replacing a software system.

Software development is the most time-consuming phase of software development life cycle, but it’s more predictable than the Design phase. Using the design document, software developers write code for the components. The tasks are divided between the team members according to their area of specialization.

Examples of the SDLC in action

Ideally, Project Managers and Development staff collaborate with Operations and Security teams to ensure all perspectives are represented. As we’ll discuss later, Agile methods tend to “wind together” all of these steps into a tight, rapidly-repeating cycle. What are the best software engineering practices, and why do you need them? To answer this question, you might recall your first music lessons when you were learning to play the guitar. You were told to place your fingers on the stings in the right position so that you could fret notes in the most convenient way possible….

definition of software life cycle model

Moreover, the team decides and documents the technologies, restrictions, workload, budget, and interaction with third parties. Software Development Life Cycle is a process of developing, modifying, maintaining, and replacing a software system. Discover essential SDLC phases, models, and a real-world application in this article to start building premium software for your enterprise. Software is a complex product developed and delivered through a series of steps. All development begins the same way; software, like all products, starts as an idea. The idea becomes a document and maybe a prototype and will exist in a few forms before getting into the hands of an actual user.

Phase 4. Testing

It uses incremental and iterative development in which changes are made according to user feedback. Adaptive SDLC is more suited for products that exist in a dynamic environment and require constant enhancements. It does not follow solid process models as it lacks a detailed outline. Usually, the developers start the project with just the budget and resources for the idea development. It is time-consuming, and the completion of a stage takes longer. It is costly as it requires a team of experts to make a correct risk assessment of the product application under development.

Software development is a huge undertaking and requires thorough planning, regardless of the model. Software development should begin with requirements gathering and undergo architecture design, development, testing, and deployment. After that, the SDLC continues with post-launch maintenance, including software updates and support. Waterfall and Agile are the two most common methods applied in software development, although many companies incline towards Agile nowadays, given the ever-evolving needs of the market. Models allow you to effectively plan and follow a software development process step-by-step, making it as predictable as possible.

Stage 1: Planning and Requirement Analysis

When we reviewed their work, the app had very few bugs, and we didn’t request very many changes to their work. Our consultants will help you to supplement your team or build a high-quality mobile/web app from scratch. It may be hard to estimate the overall costs at the start of the software project. Get expert engineers to supplement your team or build a high-quality app from scratch and bring it to life. It costs and duration, detects issues early, and involves developers for consensus.

An SDLC is essential because it provides detailed guidelines for product development. It helps minimize unnecessary errors and costs that may arise as a result of unplanned events. Moreover, the SDLC enables developers to create high-quality software. The development stage is the section where the coding of the application occurs. The developers will use the SDLC and SRS documents to create an application in line with the system design concepts and required specifications.

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This conceptual model also makes it possible for developers to build a working version of the product early. That contributes to the less expensive implementation of changes. It’s important to note that each distinct process in the life cycle plays a vital software life cycle model role in developing a quality software product. They are reliant on each other and the efforts combine to create a highly-functional, error-free result. Above all, the planning phase includes determining if the project is feasible with existing resources.

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The maintenance stage covers everything that happens after the proposed system is launched. For example, it can include repairs in case of new system failures, adding new features, and upgrades. The code is specifically written to address the predefined requirements. The steps within this phase can vary depending on the SDLC model that can be used. It expands on the process by adding testing related to every step in the process. But like the waterfall model, it can lead to risks from the lack of flexibility.

Systems analysis and design

Named after a Japanese Kanban board, this lean methodology focuses on visualizing workloads in which work is pulled as capacity permits, rather than work being pushed to developers. Whichever model you choose, we are ready to offer convenient tools that help automate each stage. The model adds flexibility to the development and allows altering the plan as you go. Lacks flexibility and is not designed for frequently evolving projects.

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