Agile vs Waterfall: Understanding Two Important SDLC Methods

When organizations develop software or digital products, they usually follow a structured process to manage the work. This process is called the Software Development Life Cycle (SDLC). Two of the most commonly used approaches in SDLC are Waterfall and Agile. Both methodologies help teams plan, develop, and deliver software, but the way they work is quite different. Business analysts play an important role in both approaches because they understand the requirements and communicate them clearly to the technical team. The Waterfall model is one of the oldest and most traditional approaches used in software development. In this model, the project moves step by step in a fixed sequence. The process usually starts with gathering requirements from stakeholders. Business analysts collect detailed information about what the client wants and prepare proper documentation. Once the requirements are finalized, the next step is system design where the technical structure of the project is planned. After the design phase, developers start building the system based on the approved requirements. When development is completed, the system goes through testing to identify errors or bugs. Once testing is successful, the product is deployed for users. Finally, maintenance is provided to fix any issues that appear after release. Since every phase must be completed before moving to the next one, changes in requirements are difficult to implement in the Waterfall model. Agile methodology, on the other hand, follows a more flexible and collaborative approach. Instead of completing the entire project at once, the work is divided into smaller parts called iterations or sprints. Each sprint usually lasts for a short period, such as two to four weeks. In Agile, teams continuously communicate and work closely with stakeholders to improve the product step by step. The process usually begins with defining the product vision and creating a product backlog that contains all the tasks and requirements. During sprint planning, the team selects specific tasks from the backlog to complete in the upcoming sprint. Developers then start working on those features while testing is also done during the same cycle. Teams often conduct daily stand-up meetings to discuss progress and any challenges they are facing. At the end of each sprint, the completed work is reviewed with stakeholders and feedback is collected. The team also conducts a retrospective meeting to discuss improvements for the next sprint. Both Agile and Waterfall have their own advantages depending on the type of project. The Waterfall model works well when project requirements are clear and stable, because the entire process is planned in advance. Agile, however, is more suitable for projects where requirements may change or where continuous improvement is required. Many modern organizations prefer Agile because it allows faster delivery and better collaboration between business and technical teams. From a business analysis perspective, understanding both methodologies is important. In the Waterfall approach, business analysts focus heavily on detailed documentation and requirement clarity at the beginning of the project. In Agile environments, they often work closely with product owners and development teams, continuously refining requirements and supporting the team during each sprint. Both approaches aim to deliver quality software, but they differ in how the work is planned, executed, and improved throughout the development process.