⚡ Linear, Sequential, and Rigid. Is it right for your project?
What is the Waterfall Methodology?
The waterfall project methodology is a traditional way of organizing the main stages of a project.
It is a sequential, linear approach to the development of IT systems that divides the project into distinct phases.
Each phase of development is dependent on the outcomes of the previous phase.
Why C is correct: The textbook states: "The key characteristic of the waterfall methodology is that each phase must be completed before moving on to the next one."
Because of this strict sequencing, changing the scope mid-project can mean having to start the project from the very beginning.
This makes it fundamentally opposite to flexible, iterative approaches (like Agile).
Perfect vs. Imperfect Projects
Because of its rigidity, the waterfall approach is very useful for small or simple projects with few requirements,
and also for projects where the requirements are clearly defined and unlikely to change.
The strict structure makes planning and budgeting highly predictable in these scenarios.
👍 The Perfect Example: A project that requires the upgrading of a server and related network infrastructure in an office.
It is highly unlikely that there would need to be much variation in the requirements. You know exactly what needs to be replaced and how it should work.
Why B is correct: The text explicitly states: "For example, a project that requires the upgrading of a server and related network infrastructure in an office could follow the waterfall method as it is unlikely that there would need to be much variation in the requirements."
The Downside of Rigidity
Because of the linear nature of Waterfall, there is little room for change in the project scope.
If a requirement is missed or needs to be updated halfway through, doing so can mean having to start the entire project from the beginning,
which is time-consuming and expensive.
👎 The Bad Example: The development of a new and complex app for a large bank.
Such projects involve many stakeholders, evolving technologies, and market conditions that change constantly.
Waterfall is highly unlikely to work here because the requirements are not fixed at the start.
Why C is correct: The textbook states that "the development of a new and complex app for a large bank is highly unlikely to follow the waterfall method."
Because there is "little room for change" and "doing so can mean having to start the project from the beginning," it is impossible to manage a complex app where requirements evolve over time.
🎉 You've mastered the Introduction to Waterfall!
Recap:
• Sequential & Linear: You cannot move to the next phase until the current one is finished.
• Best For: Simple projects with clearly defined, unchanging requirements (e.g., infrastructure upgrades).
• Worst For: Complex projects that require flexibility and changing requirements (e.g., new banking apps).
Ready to dive into the specific phases? That will be covered in the next lesson.