Agile vs. Waterfall: Choosing the Right Approach as a Business Analyst

From a BA perspective, I don't think there is one universal answer. Both methodologies have their own strengths, and the right choice depends on the project, the business environment, how stable the requirements are, and how much flexibility the team needs.For a Business Analyst, understanding these differences is more important than simply deciding that one methodology is better than the other. Waterfall follows a structured and sequential approach where one phase is generally completed before moving to the next. From a Business Analyst's perspective, this means a lot of focus is placed on understanding and documenting requirements upfront. A BA may work on documents such as Business Requirement Documents, Functional Requirement Specifications, use cases, process flows, and requirement traceability matrices.This approach can work well when the requirements are clearly understood and are unlikely to change significantly during development. For example, if a company is implementing a system involving compliance, approvals, or clearly defined operational processes, having detailed requirements and documentation before development can provide clarity to everyone involved. However, one challenge with Waterfall is that business requirements don't always remain the same. As a project progresses, stakeholders may understand their needs better or discover new requirements.If a major change is identified after development has already started, it can affect the timeline, cost, documentation, and development effort. This is where Agile provides a different way of working. Agile focuses on delivering the product incrementally through smaller iterations, usually called sprints. Instead of trying to define everything at the beginning, the team continuously learns, develops, receives feedback, and improves the product. From a BA perspective, this creates more opportunities for collaboration. The BA works closely with stakeholders, Product Owners, developers, and testers to understand requirements, refine user stories, define acceptance criteria, clarify questions, support backlog refinement, and incorporate feedback.Requirements are not necessarily treated as something that is documented once and then left unchanged. They can evolve as the team gains a better understanding of the business problem. Imagine a company developing an internal asset management application. Initially, the business may only identify a requirement for tracking assets. Once users start interacting with the solution, they may realize that different users need different access levels or that additional functionality is required for invoices, approvals, asset movement, or compliance activities. Agile allows the team to incorporate these learnings into future iterations instead of trying to predict every requirement at the beginning. This doesn't mean Agile is always the better option. Agile can be challenging when stakeholders are not available for regular feedback, when requirements need extensive upfront definition, or when the project operates under strict regulatory or contractual constraints. Similarly, Waterfall isn't necessarily outdated or ineffective. In projects where requirements are stable and predictable, its structured approach can provide the clarity and documentation that the project needs. So, which methodology is best for a Business Analyst? Personally, I would say that the most valuable approach is to understand both rather than choosing one blindly.A good BA should be able to work in a structured environment when detailed planning is required and also adapt when requirements change.The methodology may change, but the core responsibilities of a BA remain similar: understanding the business problem, identifying stakeholders, asking the right questions, analyzing processes, identifying gaps, documenting requirements, and making sure the final solution actually addresses the business need. For me, the biggest lesson is that methodology is only a framework. It doesn't define how effective a Business Analyst is. A strong BA is someone who can adapt to the project, communicate clearly with different stakeholders, understand the bigger business picture, and remain focused on solving the right problem. Instead of asking, “Agile or Waterfall, which one is better?”, I think the more useful question is, “What does this project need, and which approach will help us deliver the right solution effectively?” That shift in perspective is what makes a Business Analyst valuable, regardless of the methodology being used.