In software development, where requirements change periodically, the waterfall model works well.

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The waterfall model is a linear, sequential approach to software development that assumes requirements and design are fixed at the beginning and the development process then flows downwards (like a waterfall) through the phases of analysis, design, implementation, testing, and maintenance. It is not well suited to handling changing requirements, as it is difficult and costly to go back to previous phases once they have been completed. Agile methodologies are better suited to handle changing requirements.

In Software Development, Where Requirements Change Periodically, the Waterfall Model