Name of parameters (shown on the tool tip)

Start Time of the task (Low) 

Type of the field

Calendar Control

Short name (shown in the header)

Start Low

Description

Low Start Time is used for probabilistic calculations and does not affect the baseline project schedule. If you modify the Low Start Time, the Constraint is set to Must Start On”. See “Start, Finish Times, and Constraints” for more details. Particular meaning of low start time depends on the statistical distribution for start time. See “How to define distribution for Start Time, Cost, and Duration” for details. 

Related Fields

Start Time Base - baseline 

Start Time High - baseline