According to project management principles, what is the potential disadvantage of a Waterfall approach?

The Waterfall approach in project management is characterized by its linear and sequential nature. Each phase of the project must be completed before the next one begins, which means that once a phase is finished, revisiting it can be challenging. This structure can lead to a significant disadvantage: inflexibility. If changes to project requirements are needed or stakeholders decide they want to modify certain aspects of the project after a phase is completed, accommodating such changes can be both difficult and costly. The time lost in revisiting completed phases and the additional resources required to implement changes contribute to the overall increase in project costs. This rigidity makes the Waterfall method less adaptable in dynamic environments where project changes may be frequent and necessary for addressing stakeholder needs or market shifts.

In contrast, the other options highlight characteristics that are often associated with more agile methodologies rather than the Waterfall model, where client interactions, team collaboration, and quick delivery are less pronounced due to the structured and sequential nature of projects.