System Development Life Cycle Phases : A Detailed List

The SDLC is a foundational concept that can be implemented in practice in numerous different
ways. Teams decide which systems development life cycle methodology to follow based on the
project’s specifics, programmers’ experience, client’s preferences, and other factors. But
no matter which option they choose, the process will contain all SDLC phases. The difference
is how these phases are structured and which one gets the largest share of the attention. Ideation is the first among seven phases of the existing system development life cycle.

systems life cycle model

If you are unable to find any evidence that an SDLC methodology exists, or that life cycle requirements were ever taken into consideration, you’ll need to create these requirements ex post facto. Creating requirements ex post facto is never ideal, but it does show that going forward your business owner acknowledges the importance of such phases. In some cases, it may be that life cycle requirements were followed, but never documented. In the eyes of the independent security assessment team, if something is not documented, it doesn’t exist.

Examples of the SDLC in action

While time-consuming, prototyping is much less expensive than making radical changes after the development phase. All software begins as a concept, and progresses through a series of phases until a release is developed and deployed. The Software Development Life Cycle of an application or system continues, with updates and new features, until the day it is decommissioned or replaced.

systems life cycle model

It’s dynamic, adaptive, flexible, lightweight, and extremely responsive, working in sprints with a defined time period to complete small and highly manageable tasks, thus reducing the time in which software goes live. Through and through, Agile is an advocate of adaptive planning, evolutionary development, continuous improvement, responsiveness, flexibility, and quick delivery. 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. It’s very common for the project teams to use UML diagrams in the design phase to design the system’s architecture. This crucial phase is where project members dive deep and define the technical requirements of the system so they can be properly addressed. Setting a strong foundation and defining a clear understanding of a project is crucial to the success of any information system.

The Seven Phases of the SDLC

It is important to note that many of the activities throughout the life cycle are iterated. For Example, A client wants to have an application which concerns money transactions. In this method, the requirement has to be precise like what kind of operations will be done, how it will be done, in which currency it will be done, etc. While there are some drawbacks, SDLC has proven to be one of the most effective ways for successfully launching software products. It is important that you have contingencies in place when the product is first released to market should any unforeseen issues arise. Microservices architecture, for example, makes it easy to toggle features on and off.

The project passes through four phases (planning, risk analysis, engineering and evaluation) over and over in a figurative spiral until completed, allowing for multiple rounds of refinement. Even more rigid is the related Verification and Validation model — or V-shaped model. It’s characterized by a corresponding testing phase for each development stage. This SDLC model can be useful, provided your project has no unknown requirements.

Software Development Life Cycle (SDLC)

The typical stages of the system development life cycle are planning and feasibility, requirements analysis, design and prototyping, software development, system testing, implementation, and maintenance. SDLC methodologies fit within a flexibility spectrum ranging from agile to iterative to sequential. SDLC models can be described along a spectrum of agile to iterative to sequential. Agile methodologies, such as XP and Scrum, focus on light-weight processes which allow for rapid changes along the development cycle.

SDLC is also an abbreviation for Synchronous Data Link Control and software development life cycle. Software development life cycle is a very similar process to systems development life cycle, but it focuses exclusively on the development life cycle of software. In this article, we would review the various paradigms of SDLC-based development approaches which have emerged in the discipline of Systems Analysis and Design. This model works best for small projects with smaller size development team which are working together.

Importance of SDLC

As the disclipine has matured, practices and methods for developing software have evolved. Penetration testing – Penetration testing analysis helps you find and fix exploitable vulnerabilities in your server-side applications and APIs. Reduce your risk of a breach by identifying and exploiting business-critical vulnerabilities, before hackers do. Threat Modeling – Bring your application design weaknesses to light by exploring potential hacker exploits. Spot design flaws that traditional testing methods and code reviews might overlook. There are several pitfalls that threaten to negatively impact an SDLC implementation.

  • The typical stages of the system development life cycle are planning and feasibility, requirements analysis, design and prototyping, software development, system testing, implementation, and maintenance.
  • New software development methods have grown out of private and public software projects.
  • Modern SDLC processes have become increasingly complex and interdisciplinary.
  • Users offer input on the prototype, developers implement the requested changes, and the team creates a better version of the prototype.

Without using an exact life cycle model, the development of a software product would not be in a systematic and disciplined manner. When a team is developing a software product, there must be a clear understanding among team representative about when and what to do. Suppose a software development issue is divided into various parts and the parts are assigned to the team members. From then on, suppose the team representative is allowed the freedom to develop the roles assigned to them in whatever way they like. Once developed, the software then goes through phases of testing, and is finally deployed for use. Waterfall is considered by many to be too rigid to adapt to changing requirements.

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Systems analysis and design (SAD) can be considered a meta-development activity, which serves to set the stage and bound the problem. Architecture, and business architecture, and relies heavily on concepts such as partitioning, interfaces, personae and roles, and deployment/operational modeling to arrive at a high-level system description. 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. Few people in the modern computing world would use a strict waterfall model for their Systems Development Life Cycle (SDLC) [11] as many modern methodologies have superseded this thinking.

systems life cycle model

The beauty of software development is that methodologies can be combined to create a hybrid solution that distinctively addresses the unique needs of a project. Usually, organizations prefer to trust system analysts to make that decision and select systems life cycle model the best-suited methodology or combination of models. 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.

System Design

Prototypes are a way for customers to get a sneak peek of how their application will look; they might even discover their original idea is not good enough and change it during this phase. By the end of this phase (or, at the very least, the next one), each team member must understand their roles and tasks. 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. The following table summarizes the important tasks in the stages of the SDLC and highlights the main deliverables from each task. Most teams rely on automated tests to speed up this phase, but some manual examinations are also valuable (penetration tests are a good example). In high-maturity enterprises, this phase is almost invisible; software is deployed the instant it is ready.