Specifying delivery dates when ordering materials is crucial for ensuring timely project progression. This helps in coordinating different phases of construction or manufacturing activities, as delays in material delivery can lead to project slowdowns or disruptions. When materials arrive on schedule, the workflow is smoother, and it allows the project team to adhere to timelines, meet milestones, and avoid costly downtime. Timeliness contributes to maintaining the overall schedule, ensuring that labor and other resources are effectively utilized, and ultimately leading to the successful completion of the project within the planned timeframe.