Agile vs. Waterfall: Choosing the Right Approach for Business Analysis

Imagine planning a long road trip. One approach would be to decide the complete route, book every hotel, plan every stop, and follow the itinerary from beginning to end. Another approach would be to plan the first part of the journey, start travelling, and adjust the route as you learn more along the way. Both approaches can work, but the better choice depends on how certain you are about the destination and how much you expect things to change. Software projects face a similar choice when deciding how work should be planned and delivered. Two commonly used approaches are Waterfall and Agile. For a Business Analyst, understanding the difference is important because the chosen approach affects how requirements are gathered, documented, prioritized, communicated, and changed throughout the project. Waterfall follows a sequential approach, where the project moves through defined stages in a planned order. It is a linear model in which each phase is completed before the next phase begins. Typical stages include requirements analysis, design, development, testing, deployment, and maintenance. The Business Analyst plays an important role at the beginning of such a project. Requirements are gathered from stakeholders, analyzed, documented, reviewed, and typically finalized before development begins. Keeping a clear record of the requirements is important so that the development team and stakeholders have a common reference throughout the project. Consider a hospital that is planning to implement a system for managing patient information and services. Before development begins, the BA may need to understand the requirements of doctors, nurses, reception staff, administrators, billing teams, and patients. These requirements can then be documented and approved before the development team starts building the system. This approach works particularly well when the requirements are well understood and unlikely to change significantly. It can also be useful when the project requires extensive documentation, formal approvals, or compliance with regulations. However, Waterfall has a limitation: discovering a major problem late in the project can be expensive. If stakeholders realize during testing that an important requirement was misunderstood, changing the solution may affect requirements, design, development, and testing that have already been completed. Agile takes a different approach. Instead of attempting to define and build the entire solution at once, the product is developed in smaller increments, with regular feedback and opportunities for adjustment. In Agile, requirements are not necessarily treated as something that must be completely finalized at the beginning. They can evolve as stakeholders provide feedback and the team learns more about the product. Consider a team working on a new food delivery application. Instead of building every feature before showing anything to users, the team might first develop registration and restaurant search, then add ordering, payment, delivery tracking, and loyalty features in later increments. This approach allows the team to respond to changing priorities and use feedback to improve the product as development progresses. One commonly used framework for Agile development is Scrum, where the work is divided into short cycles called Sprints. The requirements or features that need to be developed are maintained in a Product Backlog, which is a prioritized list of work for the product. Within the backlog, requirements can be written as user stories. The Business Analyst may work with the Product Owner, stakeholders, developers, and testers to understand these requirements, refine the user stories, and define acceptance criteria that describe the conditions the solution must meet. This helps the team develop a clear understanding of what needs to be delivered in each Sprint. The two approaches differ mainly in how the project is planned, how requirements are handled, and how the team responds to feedback and change. In Waterfall, the BA generally performs detailed analysis early in the project because the development team needs a clear understanding of the requirements before moving forward. In Agile, analysis is more continuous, with requirements being refined and prioritized as the product develops. So, which methodology is better for Business Analysis? There is no single answer. Waterfall can be more suitable when requirements are stable, the scope is clearly defined, and the project requires detailed planning, documentation, or formal approvals. Agile is often a better fit for projects where priorities can shift, regular stakeholder input is needed, and the solution is expected to grow through successive releases. The decision can also depend on factors such as project complexity, business priorities, regulatory requirements, stakeholder involvement, risk, and how much uncertainty exists at the beginning of the project. Some projects may even use a combination of approaches, depending on what works best for different parts of the initiative. Ultimately, Agile and Waterfall are different approaches to managing software development, but the purpose of business analysis remains the same. Whether requirements are defined in detail at the beginning or refined throughout development, the Business Analyst helps connect the business need with the solution being developed. The right choice ultimately depends on the circumstances of the project and the approach that best supports its goals, constraints, and expected changes.