What is the Software Development Lifecycle? Definition and Overview

Every phase of the SDLC life Cycle has its own process and deliverables that feed into the next phase. SDLC stands for Software Development Life Cycle and is also referred to as the Application Development life-cycle. The agile methodology produces ongoing release cycles, each featuring small, incremental changes from the previous release. The agile model helps teams identify and address small issues in projects before they evolve into more significant problems. Teams can also engage business stakeholders and get their feedback throughout the development process.

These baselines are established after four of the five phases of the SDLC and are critical to the iterative nature of the model . Software Development Life Cycle is a sequential model of time from initial planning to final delivery. Let’s take a look at two interesting models that are not widely used. This is a sort of document that specifies all those things that need to be defined and created during the entire project cycle.

definition of software life cycle model

This stage is intermingled with the next in that individual modules will need testing before integration to the main project. Fits for small development efforts, small development teams, and might also be suitable for short-term experiments. If project managers lack expertise or some participants refuse to follow the process, the cycle will fall apart, influencing the quality of the final product. SRS is a reference for software designers to come out with the best architecture for the software. Hence, with the requirements defined in SRS, multiple designs for the product architecture are present in the Design Document Specification . In this stage, all the requirements for the target software are specified.

Phase 4: Coding

A true V-shaped model does not have a dedicated testing phase since each development stage has its own QA sequence. Ensuring every phase of the SDLC accounts for security is vital, but do not overlook the value of a dedicated testing phase. There's no reason not to have a separate stage for in-depth testing even if other SDLC steps have some built-in security analysis. Agile vs. Waterfall There’s no shortage of processes, frameworks, and philosophies when it comes to project management, but they ultimately fall into one...

Several variants of Agile have emerged since the signing of the Manifesto. Scrum defines specific roles and events, known as ceremonies, as part of its practice. Kanban is simpler, with fewer prescriptions and more flexibility. Agile teams often combine these together to adapt a bespoke process that fits them best.

Each stage has iterative cycles performed to further improve the product. These requirements ensure that the product has all the necessary components needed for it to operate as intended. The requirement analysis stage ensures that all the resources are gathered before the development commences.

Software Development Life Cycle (SDLC): Definition, Models, And Phases

We will dwell on the SDLC life cycle concept’s benefits in more detail further in this article. Hiren is VP of Technology at Simform with an extensive experience in helping enterprises and https://globalcloudteam.com/ startups streamline their business performance through data-driven innovation. Simform provides you with top performing extended team for all your development needs in any technology.

definition of software life cycle model

Such activities may include but are not limited to gathering client input by conducting focus group meetings or usability testing sessions with representative users and potential customers. The maintenance stage is often omitted in the process but should be a part of the development of any software project by all software teams. As software is used over time by end-users or customers, it may need to be changed or adapted in the software development process.

Enterprise Applications Development: Best Examples, Strategies, Tools

In the fantastic world of development there is a certain framework that developers use to produce high-quality software efficiently and cost-effectively. This framework eables businesses to follow the development process in a clear and methodical way. Developers are now responsible for more and more steps of the entire development process.

This is an advanced version of the classic Waterfall SDLC model. It provides in-depth control of the current process before moving to the next stage. With the V-model, testing starts as early as the requirements writing stage.

  • The tasks are divided between the team members according to their area of specialization.
  • In practice the results of one activity can feed the other in an iterative process.
  • It involves the drafting and creation of the working SDLC process that the development team will use in the development cycle.
  • The development team evaluates the project and determines which elements of the other process models to incorporate.
  • The software development life cycle is also known as the software development process.

The output of the testing phase is improved software, ready for deployment to a production environment. 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. As such, organizations can easily calculate the cost of required resources. It ensures that the product is of high quality and provides time frames for the completion of different stages and the entire product.

Upon release, the software is maintained until it is discontinued. Typically, there will be between five and seven steps—although there can be more. SDLC works by lowering the cost of software development while simultaneously improving quality and shortening production time.


Once the requirement is understood, the SRS document is created. The developers should thoroughly follow this document and also should be reviewed by the customer for future reference. There are several different methodologies used to implement the agile model.

This web service is geared towards teamwork without traditional ways of information exchange and with no mobile applications. Most of you have probably heard of or even worked on Trello and Basecamp. Asana is less well known, but it has reacher functionality than the popular Basecamp, while maintaining a clear interface, unlike Trello. It shares a plethora of functions from setting goals and timelines to real-time sync and over 100 integrations. The one thing that unites all these SDLC methodologies is the possibility to streamline complex processes by making use of various tools during each phase. Within this approach, the whole project is broken down into several iterations or time periods that usually take from two to six weeks.

This SDLC testing model helps the team to adopt elements of one or more process models like a waterfall, incremental, waterfall, etc. Agile methodology is a practice which promotes continue interaction of development and testing during the SDLC process of any project. In the Agile method, the entire project is divided into small incremental builds. All of these builds are provided in iterations, and each iteration lasts from one to three weeks. Once the software is complete, and it is deployed in the testing environment.

definition of software life cycle model

The shortcomings of this after-the-fact approach were the inevitably high number of vulnerabilities or bugs discovered too late in the process, or in certain cases, not discovered at all. Today, it is understood that security is critical to a successful SDLC, and that integrating security activities throughout the SDLC helps create more reliable software. Therefore, developers develop units and modules step by step in a weekly or monthly work plan. Additionally, the coding phase is the longest phase of the SDLC process, and it requires a focused approach for the developers. A quality software system is one that meets users’ needs and expectations and for which the delivered solution and the adopted process meet specified requirements. This software is designed to simplify workflow management for a wide variety of teams.

Extra: Software Maintenance

If you are new to the IT industry or a newbie in your IT career, you might be curious about how all that software is developed. SDLC stands for “Software Development Life Cycle.” As the name suggests, it is a process for developing software. In other words, SDLC is a structured way to create and develop high-quality software. The process starts from planning but not finishes after the delivery of the product. As you may understand from the name , SDLC is not a linear project management framework. The stages of the software development life cycle are which describe how to develop and maintain particular software.

Instead of rushing into a project, more and more companies are turning to SDLC strategies that enable them to ship high-quality software as quickly, safely, and cost-effectively as possible. The team sets the entire product-development plan according to the initial requirements-gathering and analysis. However, this first phase can definition of software life cycle model lead to a failed product if the team doesn’t properly assess the market’s needs. This is the stage where the engineering team actually codes the product. At this stage, the development team translates the high-level overview communicated in the roadmap into a tactical set of assignments, due dates, and day-to-day work schedules.

For instance, a software development problem is divided into multiple parts and assigned to different team members. One representative might start the coding for his part, another might prepare the test documents first, and someone might begin with the design phase. Systems Development Life Cycle is a process used by a systems analyst to develop an information system, including requirements, validation, training, and user ownership. The software has a powerful influence on its users, who often value it as much as physical goods or services which have been encountered only tangentially if at all. As two utterly different approaches to software development, Agile and Waterfall are suitable for different kinds of projects.

2 Secure Software Development Life Cycle

This includes compiling requirements, studying user personas, and agreeing on the product’s purpose. During this phase, the team will also discuss the opportunities and risks of pursuing the project. This is why Software Testing Help refers to this phase as both requirements gathering and analysis. We’ve reviewed many variations of software development lifecycle models.

Following proper CI practices, work stops until the build is successful. This prevents errors and defects from progressing into software that should be as bug-free as possible. The Waterfall method of software development follows a rigid, predetermined path through a set of phases. Ironically, the paper credited as the origin of the Waterfall method describes it as being fundamentally flawed.

Software Development is the development of software for distinct purposes. For software development, there is a specific programming language like Java, Python, C/C++, etc. The entire process of software development isn’t as simple as its definition, it’s a complicated process. Accordingly, it requires an efficient approach from the developer in the form of the Software Development Life Cycle . The best way to ensure that tests are run regularly, and never skipped for expediency, is to automate them. Tests can be automated using Continuous Integration tools, like Codeship.

It’s important that every developer sticks to the agreed blueprint. Also, make sure you have proper guidelines in place about the code style and practices. Testing is the next phase which is conducted to verify that the entire application works according to the customer requirement. This SDLC model is documentation-intensive, with earlier phases documenting what need be performed in the subsequent phases. The main focus of this SDLC phase is to ensure that needs continue to be met and that the system continues to perform as per the specification mentioned in the first phase. This design phase serves as input for the next phase of the model.