Software development lifecycle (SDLC) is a process which is used to design and develop a high-quality software. The process consists of seven phases. Each of them illustrates different stages of the process development.

In this article, we would like to show you what SDLC is, what it means, and how its phases work.

What is SDLC?

Software development life cycle (SDLC for short) is also known as software development process. It enables users to transform a newly developed project into an operational project. It can be said that it is a multi-stage, iterative process, structured in a methodical way. This process is used to model or provide a framework for technical and non-technical activities to deliver a qualified system that meets or exceeds the company’s expectations.

The process consists of seven phases in the application life cycle. SDLC provides a detailed plan that provides information on how to develop, build, and improve your software. Each stage of the SDLC life cycle has its own product and defines its own process to be achieved in order to proceed to the next phase.

In many cases, SDLC is considered as a model that determines organizational, personal or budgetary constraints for a system project.

Such a cycle has a beginning and an end, and the methods appropriate to the system development lifecycle strategy ensure clear, distinct, and defined work phases in the planning, design, testing, implementation, and maintenance of information systems.

It also highlights the different stages of the development process so that users can see and understand what activities are involved at a given stage. It is also used to inform them that at any time you can repeat steps or rewrite a previous step when the system needs to be modified or improved.

Importance of Software Life Cycle (SDLC)

– role of the project guide.

– helps in assessing, planning and estimating results.

– provides a framework for a standard set of activities.

– ensures correct and timely delivery to the customer.

System Life Cycle Origin

System Life Cycle Origin

The term SDLC was created in the 1960s. Back then, computers filled the entire room. There was an urgent need to define processes and equipment focused on building large business systems. In the past, teams were small and users were less demanding, so there was no need to fine-tune a methodology that would steer the system development lifecycle at that time. Technology has evolved and systems have become more complex. Users want technology that works well. This is why models and frameworks have been developed to guide your business through an organized system development cycle. Today’s approach to the development of technological systems is adapted to the constantly changing needs of a unique organization and its users.

System life cycle phases

Initially, the system development cycle consisted of five stages. Currently, this system, as we have mentioned many times, consists of seven phases. This was helpful for system analysts who could better define clearer actions to achieve certain goals.

SDLC phases

Here is how each of the current phases looks in turn:

  1. Planning
  2. Systems analysis and requirements
  3. System design
  4. Development
  5. Integration and testing
  6. Implementation
  7. Operations and maintenance


The first stage of the system development process is planning. In this step, determine if you need a new system to achieve your company’s strategic goals. We create an initial plan of the company’s business initiative, which consists in acquiring resources for building infrastructure in order to modify or improve the service. The company tries to meet or exceed the expectations of its employees or customers. The purpose of the first step is to determine the scope of the problem and try to identify solutions. At this stage, we consider resources, costs, time, benefits and many other elements.

Systems analysis and requirements

Systems analysis and requirements

During the second stage, companies work on the source of the problem or the need for change. If we are working on a problem, all possible solutions should be analyzed to determine the best fit for the ultimate goals of the project. In this phase, teams must consider the functional requirements of the project. Thanks to the system analysis or needs analysis, we can make sure that the new system is able to meet specific requirements. Systems analysis is important to determine the company’s needs as well as how they can be met, who will be responsible for each element of the project, and what kind of schedule to expect.

System design

In the third phase, we should describe in detail the necessary specifications, functions and operations that will meet the functional requirements of the proposed system that we want to implement. During this phase, hardware or software, networking capabilities, processing, and procedures are taken into account in order for the system to achieve its goals.


The fourth phase is when the real work begins – the developers are engaged to do the main work on the project. A flowchart is used to ensure the proper organization of the system’s process. This phase marks the end of the initial part of the process as well as starting production.

Integration and testing

Integration and testing

The fifth phase is to determine whether the proposed project meets the initial set of business goals. The software is implemented in a test environment, where the testing team checks the functionality of the system on the basis of design documents provided to it. This phase allows you to find some bugs and glitches that are communicated to the developers. They fix detected errors and return the project to quality control. Tests will be performed until the end user finds the acceptable version. The next part of this phase will be a verification and validation to help ensure a successful completion of the program.


The sixth phase involves the actual installation of the newly developed system. This step brings the design to production, taking data and components from the old system and placing them on the new one. Sometimes product implementation is done in stages, in line with the company’s business strategy.

Operations and maintenance

The final stage includes regular required updates. Here the end user can increase the system performance or add new features etc. if he wants to. Users start using the developed system after system implementation.

SDLC benefits

The implementation of SDLC enables the initial planning and analysis of structured phases and goals. In addition, these processes are not limited to one universal methodology but can be easily adapted to changing needs.

 A well-defined system life cycle should:

  • show an image of the entire project, define a schedule
  • defines the costs and deadlines of the project
  • ensure the verification of objectives and results
  • improve the quality of the final system thanks to verifications at every stage

Cycle disadvantages

  • some methods are considered inflexible, some suffer from outdated processes
  • difficulties arise in responding to changing circumstances
  • many programmers prefer to control and test the program on an ongoing basis, and here the tests take place at the end of the cycle
  • the documentation needed can be overwhelming

The software development cycle is a process that allows you to obtain software of the highest quality and lowest cost in the shortest possible time. It provides a well-structured phase flow that helps the organization rapidly produce high-quality software that is well-tested and ready for production use.

Popular models include such models as:

Popular models

• The waterfall method is a continuous sequence of actions that flows downward, just like the name. This traditional engineering process that closes each phase when finished is often criticized for being too rigid.

• The V-shaped model is an adaptation of the Waterfall where testing is an integral part of closing each phase.

• The prototype method advocates a plan to build multiple software methods that allow different elements to be tried before they are fully developed.

Rapid Application Development (RAD) is a hybrid of the prototype method but works so as not to emphasize initial planning for rapid prototyping and testing of potential solutions.

• The spiral method provides more process steps that are graphically represented in the spiral formation and is generally credited with providing greater flexibility and process customization.

Agile methods are software-based systems that provide feedback through an iterative process and include Kanban or Scrum.

The Software Life Cycle (SDLC) is a systematic software development process. It is to ensure the quality and correctness of the developed software. Provides a framework for a standard set of activities and products.

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