The System Development Life Cycle SDLC

SDLC consists of a precise plan that describes how to develop, maintain, replace, and enhance specific software. The life cycle defines a method for improving the quality of software and the all-around development process. More specifically, the SDLC defines the different stages, steps and processes for designing and developing software. Multiple models are constructed around the SDLC framework, each with their own steps and processes. The systems development life cycle (SDLC, also called the software development life cycle or simply the system life cycle) is a system development model. SDLC is used across the IT industry, but SDLC focuses on security when used in context of the exam.

This high-risk SDLC model throws most of its resources at development and works best for small projects. It lacks the thorough requirements definition stage of the other methods. It’s also important to know that there is a strong focus on the testing phase. As the SDLC is a repetitive methodology, you have to ensure code quality at every cycle.

Software Requirement

This is one of the most critical stages because it’s when your hard work gets put to the test. Software development life cycle (SDLC) is the term used in the software industry to describe the process for creating a new software product. Software developers use this as a guide to ensure software is produced with the lowest cost and highest possible quality in the shortest amount of time.

Ah, what many consider the pièce de résistance, the development phase. The SDLC phases are designed in a way that progressively develops or alters a system across its life cycle. If followed through from beginning to end, the SDLC will help deploy a fully-operational, high-quality system that meets and/or exceeds client requirements, all within the specified time and budget constraints. But None of them is perfect, and each brings its favorable aspects and disadvantages for a specific software development project or a team. For this, developers use a specific programming code as per the design in the DDS.


Let’s walk through the four phases in the RAD model as depicted in Fig. The first phase of the SDLC typically begins by gathering and analyzing the requirements for the development project. Once the project requirements have been clearly defined and planned, the SDLC proceeds to the design phase and development phases, during which the software is architected and built. In the next phase, the software enters the testing phase to ensure it’s error free and works as expected before being deployed to users. The final stage of the SDLC is ongoing monitoring and maintenance to discover and resolve any bugs that slipped through the cracks.

  • Also, during the analysis phase, the team defines the inputs and outputs of the data flow in and out of the system by undertaking a thorough system analysis of the business processes that need to be covered and solved by the future system.
  • This model is kicked off with a small set of requirements which is then enhanced iteratively with evolving versions until you reach a final product that’s ready to be implemented and deployed.
  • The security issues for a development must be identified by a formal risk analysis.
  • SDLC works by lowering the cost of software development while simultaneously improving quality and shortening production time.
  • To answer specific questions and ensure consistency in your development process, usually, all six stages try to effectively and consistently influence each other.

One of the biggest faults of the Waterfall methodology, and one that most developers complain about, is the complexity to change core functions and software features. In RAD, the development evolution is continuous and flexible to suit changing business needs, which is a must in today’s modern environment. The SDLC doesn’t necessarily stop once the system is out living and breathing. In the design phase, project members define the structure of project components as well as key elements of the system by defining the interfaces that will exchange data within the workflow.

1.5 Rapid Application Development

Much like planning for a vacation, you need to get your possessions organized and think about what bags to pack. Think about what you want to build and where your technology passions are. You could take notes, sketch diagrams, or build graphs to more deeply understand qualitative and quantitative feedback. SDLC consists of six steps which I have diagrammed here for your reference. One particularly powerful and popular framework is called the Software Development Life Cycle process (SDLC). Software testing must take place in a specialized testing environment and should test the full functionality of the system (the test environment).

Systems Analyst – IT-Online

Systems Analyst.

Posted: Wed, 11 Oct 2023 07:00:00 GMT [source]

Those who undertake testing should be made aware of the need to observe confidentiality of the information used in the testing process. Results of software testing must be documented and approved by the IT Manager and the System Owner. Effective control mechanisms shall be implemented to control multiple versions of software. Audits shall be performed internally within IT to monitor development progress. This generic SDLC model, designed by the National Computing Center of the United Kingdom in the late 1960s, was described in 1971 by A.

Object-oriented analysis and design

During DevSecOps, the team undergoes security assurance activities such as code review, architecture analysis, penetration testing, and automated detection, which are integrated into IDEs, code repositories, and build servers. However, unlike traditional software development that addresses security system development life cycle (sdlc) as a separate stage, SDLC addresses security every step of the way through DevSecOps practices. Application performance monitoring (APM) tools can be used in a development, QA, and production environment. This keeps everyone using the same toolset across the entire development lifecycle.

system development life cycle (sdlc)

In those days, teams were small, centralized, and users were ‘less’ demanding. This type of scenario meant that there was not a true need for refined methodologies to drive the life cycle of system development. However, technology has evolved, systems have become increasingly complex, and users have become accustomed to well-functioning technology. Models and frameworks have been developed to guide companies through an organized system development life cycle.

Stage 5: Test the product.

Cloud computing is one example where trust and trustworthiness39 between cloud service providers (CSPs) and a federal agency is critical for the effective application of the NIST RMF. The Federal Risk and Authorization Management Program (FedRAMP) “introduces an innovative policy approach to developing trusted relationships between Executive departments and agencies and cloud service providers (CSPs)” [11]. This might require documenting the risk information needed to address the trust requirements in contracts, service level agreements (SLAs), or other forms of legal agreements. The software development lifecycle (SDLC) outlines several tasks required to build a software application. The development process goes through several stages as developers add new features and fix bugs in the software.

system development life cycle (sdlc)

It’s very common for the project teams to use UML diagrams in the design phase to design the system’s architecture. 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.


However, repeated cycles could lead to scope change and underestimation of resources. The waterfall model arranges all the phases sequentially so that each new phase depends on the outcome of the previous phase. Conceptually, the design flows from one phase down to the next, like that of a waterfall.

system development life cycle (sdlc)

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