Understanding Software Development Life Cycle (SDLC)

Understanding Software Development Life Cycle (SDLC)

A software development life cycle model describes all the activities required to create a software product transit within its life cycle stages. It also catches these methods in which those certain activities are undertaken. A software life cycle model is also known as a process model is a diagrammatic presentation of all process of software life cycle

In different terms, the life cycle model maps the several activities on the product from its inception to retirement. Different models of life can plan the necessary developmental activities to stages in different ways. In this manner, no element in which the life cycle model is followed, the necessary activities are contained in all life cycle models though the action can be done in distinct orders in different life cycle models. During any life cycle phase, more than one activity can be done.

Need of Software Development Life Cycle (SDLC)

The development team should determine the appropriate life cycle model for a particular project and then observe it. Without the use of the exact Life Cycle model, software product development will not be organized and disciplined. When a team is developing a software product, a clear understanding between team representatives needs to know about when and what to do. Otherwise, it will lead to project failure.

This problem can be illustrated using an example. Suppose a software development issue is divided into sections and tasks are assigned to team members. Since then, the cage team has assumed that the team representative has the freedom to play the role assigned to them in any way they choose. One of the team members may start writing code for their part, another may choose to prepare the test documents first, and some other engineers may start from the design phase of the assigned roles. This is one of the best ways to make a project fail.

But in the software life cycle model, its explain the entry and exit rule of each stage A stage can only be started when the criteria for entry into that phase have been met. Therefore, without a software lifecycle model, entry and exit standards for any phase cannot be recognized. Without software lifecycle models, it becomes difficult for software project managers to monitor project progress.

SDLC Cycle

SDLC Cycle includes the following steps

  • Planning and analysis requirements 
  • Defining Requirements
  • Designing the software 
  • Developing the projects
  • Testing
  • Deployment
  • Maintenance 

Planning and analysis requirements 

Planning and analysis requirements is an important and essential phase in the software development life cycle. The senior members of the team do this task through the input of all stakeholders and domain experts or SMEs in the industry.

The quality assurance requirements of the hazards associated with the projects and the planning for their identification have also been done at this stage.

Defining requirements 

After completing the planning and requirement analysis, The next step is to represent and document the software requirements and get approval from the project stakeholders.

This is accomplished through a Software requirement specification document which is abbreviated as “SRS”,  which includes all the requirements of the product to be built and manufactured during the project life cycle.

Designing the Software 

This next step is about bringing down all the knowledge of software project requirements, analysis, and design. This step is similar to the last two products, such as input from the customer and  gathering the information

Developing the project

At this stage of SDLC, actual development starts, and programming takes place. About the written code Design implementation begins. Developers have to read about the coding guidelines explained by their organization and programming tools such as compilers, interpreters, debuggers, etc. to develop and implement the code.


After code is generated, Some important testing is to be done in this phase

  • Unit testing
  • Integration testing
  • System testing
  • Acceptance testing

It is tested against requirements to ensure that the products are addressing the needs resolved and gathering during the requirements phase.


Once the software is verified, and no bugs or errors are reported, it is deployed.


After the step of software deployment, then the maintenance phase starts. This is a process, where the final product is cared for, is called maintenance.

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