Understanding the Best Approach for Business Analysts: Agile or Waterfall?

In a year ago in a project kickoff meeting stakeholder confidently announced, "We're following Agile." Everyone nodded in agreement. Yet, as the discussion progressed, I noticed something interesting. The team wanted complete requirements documented upfront, formal sign-offs at every stage, and minimal changes once development started. Despite the Agile label, the project was operating very much like Waterfall. Experiences like these taught me an important lesson as a Business Analyst: the debate is not really about Agile versus Waterfall. The real question is how a BA can create value regardless of the methodology being used. Understanding the Two Approaches Waterfall follows a structured path. Requirements are gathered, analyzed, documented, approved, and then handed over for development. Each phase is completed before moving to the next. Think of it as building a house from a detailed blueprint. Before construction begins, every room, window, and electrical point is carefully planned. Agile, on the other hand, embraces change. Instead of attempting to define everything upfront, teams work in smaller increments, continuously gathering feedback and refining requirements. It's more like designing a house room by room while regularly consulting the homeowner. Neither approach is inherently better. Both were created to solve different business challenges. The Business Analyst's Role in Waterfall Many professionals assume that Waterfall is documentation-heavy and therefore ideal for Business Analysts. There is some truth to that. In Waterfall projects, BAs spend significant time conducting stakeholder interviews, documenting business requirements, creating process flows, defining scope, and ensuring every requirement is understood before development begins. The challenge lies in getting requirements right the first time. Since changes later in the project can be expensive, the BA must think ahead, identify risks early, and anticipate future business needs. A successful Waterfall BA acts like an architect. They create a strong foundation before anyone starts building. The Business Analyst's Role in Agile Agile transforms the BA's responsibilities rather than reducing them. Instead of producing large requirement documents, Agile BAs focus on conversations, collaboration, and continuous refinement. User stories replace lengthy specifications. Backlog grooming becomes a regular activity. Stakeholder engagement happens throughout the project rather than only during the beginning. In Agile environments, requirements evolve. Customer feedback can introduce new priorities. Market conditions may change. Regulatory updates can appear unexpectedly. The BA becomes a facilitator of change. Rather than asking, "Have we documented everything?" Agile BAs often ask, "Are we delivering the most valuable feature next?" That subtle shift changes everything. So, Which Approach Is Better? From a Business Analyst's perspective, the answer depends on the project's nature. If requirements are stable, regulations are strict, and changes are unlikely, Waterfall can provide clarity and predictability. Industries such as banking, government, and large infrastructure projects often benefit from this structure. However, if customer expectations are evolving rapidly, innovation is critical, and frequent feedback is valuable, Agile offers greater flexibility. Interestingly, many organizations today don't operate at either extreme. In projects where business requirements were documented formally before development, yet delivery occurred through Agile sprints. Also Agile teams maintain extensive documentation due to regulatory requirements. This hybrid reality is becoming increasingly common. What Matters Most for a Business Analyst? Over the years, I've realized that exceptional Business Analysts are not defined by their preferred methodology. They are defined by their ability to understand business problems, communicate effectively, and bridge the gap between stakeholders and delivery teams. A BA who can facilitate workshops, uncover hidden requirements, manage stakeholder expectations, and translate business needs into actionable solutions will succeed in both Agile and Waterfall environments. Methodologies are tools. Business value is the objective. Final Thoughts The Agile versus Waterfall discussion often creates the impression that one methodology has won and the other has become obsolete. In reality, both continue to serve important purposes. As Business Analysts, our responsibility is not to defend a methodology. Our responsibility is to help organizations solve problems, improve processes, and deliver meaningful outcomes. Whether you're writing a detailed Business Requirements Document or refining user stories before sprint planning, the goal remains the same: ensuring the right solution is delivered to the right people at the right time. And perhaps that's the most important lesson every Business Analyst eventually learns—the methodology may change, but the value we create remains constant.