Final answer:
In project management, a milestone is a significant event that marks the completion of a key phase or achievement, serving as a metaphorical marker rather than a physical one to track project progress. Option 1 is correct.
Step-by-step explanation:
In the context of a project manager, the meaning of milestone is a significant event or achievement within a project. This is an important moment that often represents a critical success factor, the completion of a key phase, or a significant accomplishment that moves the project closer to its overall goal. Project milestones are not physical markers but metaphorical ones that guide and track the progress of a project. They are valuable for understanding where the project is in terms of its timeline and what has been accomplished.
To be measurable and motivational, milestones need clear criteria, answering the question "How will I know when it is accomplished?" This helps in ensuring that project progress can be accurately assessed and that the team has a clear understanding of what success looks like at each stage.