What is the difference between the Waterfall model and Agile methodology? This ISC-focused lesson compares the two main system development approaches — Waterfall's linear, sequential, documentation-heavy process versus Agile's iterative, flexible, feedback-driven process — including when to use each and the key differences in flexibility, requirements, and deliverables. Built for accounting students and CPA, CMA and EA candidates studying information systems and controls.

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Video Timeline & Key Concepts:
0:00 — Introduction: Waterfall vs. Agile in the SDLC
1:42 — The Waterfall model: approach, best uses, pros and cons
4:14 — The Agile methodology: approach, best uses, pros and cons
6:59 — Key differences: approach, flexibility, requirements, deliverables, timeframe

Frequently Asked Questions:

What is the Waterfall model?

Waterfall is a linear, sequential development approach where each phase is fully completed and documented before the next begins, making it structured but rigid.

What is Agile methodology?

Agile is an iterative, incremental approach built on collaboration and feedback, where teams build, test, and refine software in short cycles to adapt to changing needs.

When should you use Waterfall instead of Agile?

Waterfall is best for projects with well-defined requirements, fixed scope, and clear budgets, such as many government IT systems, where little change is expected.

Why is Agile better for uncertain projects?

Agile embraces evolving requirements and delivers working software in increments, so teams can incorporate feedback and change direction without restarting the project.

What are the main differences between Waterfall and Agile?

Waterfall is sequential, rigid, requirements-upfront, and documentation-focused, while Agile is iterative, flexible, change-friendly, and focused on delivering functional software quickly.

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