What are the pros and cons of the waterfall methodology?

Definition

The Waterfall methodology is the traditional, structured approach to software development. It tackles projects in sequential stages—Requirements, Specification, Design, Development, Testing, and Deployment—where each phase depends on the formal completion of the previous one. It places significant emphasis on upfront specification.

What is Involved in Waterfall Development?

Depending on project scope, Waterfall begins with comprehensive documentation covering functional requirements, use cases, UI wireframes, and technical architecture. Because the complete system is mapped prior to writing code, developers can architect database structures and system integrations with full context.

Once specifications are approved, development progresses predictably. Since the scope is defined in detail, project milestones and budgets can be accurately managed.

Benefits and Disadvantages of Waterfall

Benefits

• Upfront Clarity: Establishes all major functional decisions before coding begins, minimising structural revisions later.
• Predictable Budgeting: Enables fixed-price commercial agreements upon completion of the detailed specification phase.
• Architectural Optimisation: Allows engineers to design scalable database schemas and technical architecture knowing all system requirements.
• Clear Resource Planning: Provides structured timelines and milestone schedules.

Disadvantages

• Upfront Time Investment: Requires dedicated effort early on to detail all requirements.
• Less Flexibility for In-Flight Changes: Revising project scope mid-development requires formal change requests.
• Sequential Testing: End-to-end user acceptance testing occurs after development phases are complete.