Late Start Time (LS) is a concept used in project management to determine the latest possible start time for an activity or task. It is one of the parameters used in Critical Path Method (CPM) and Float calculations. LS is calculated by subtracting the duration of an activity from its Late Finish Time (LF).
The calculation of Late Start Time involves determining the Late Finish Time for each activity first. The LF is determined by subtracting the duration of an activity from its Early Finish Time (EF). Once the LF has been determined, the LS can be calculated by subtracting the duration of an activity from its LF.
Late Start Time is important in project management as it helps to identify activities that are critical to the success of a project. By calculating LS, project managers can identify activities that must start on time in order to meet deadlines and avoid delays. Additionally, LS can be used to identify activities that have some flexibility in their start times, allowing for more efficient scheduling.