This is a very important task in planning out the ES, EF, LS, and LF dates for a task, because it sets the timeline that must be followed for all progress made on the project. If the range is too broad, some tasks will be done early and further developments will be delayed while waiting for others. If the range between earliest and latest dates is too narrow, then deadlines will be missed, and the project will be delayed even further. Finding this perfect range is a very crucial and difficult task in the planning phase. Bringing in the idea of risk management to determine which tasks have the highest likelihood for delays is essential to properly manage this timeline.