How to know when to use Waterfall or Agile methodology for Project Delivery

Choosing between Waterfall and Agile methodologies for project delivery depends on several key factors. Use Waterfall when the project requirements are well-defined, stable, and unlikely to change. This method is suitable for projects where each phase must be completed before the next one begins, such as in construction or manufacturing, where changes are costly and difficult. Conversely, Agile is ideal for projects with evolving requirements, where flexibility and customer feedback are critical. This method works well in software development or marketing projects where iterative progress and constant revisions are common.