Start No Earlier Than (SNET) is a start/finish task constraint that schedules a task to start after the date you specify.
When selecting this value, you must input a date in the Planned Start Date field.
This option is normally used when the project's schedule mode is set to Schedule From Start Date. When this is the case, it allows a project manager to provide a soft constraint on a task before it forces other dependent tasks to show as At Risk.
Start No Earlier Than is the default constraint if a project uses a schedule mode of "Schedule from Start Date" and if the system default start date for a new task is set to "Today," as described in "Tasks and Issues Preferences."
If the project's schedule mode is Schedule From Start Date and the system default start date for a new task is set to "Based on the Project Planned Date," the default constraint for a new task is As Soon As Possible.
If SNET is used on a Schedule From Completion Date project, then the constraint will schedule the task as it would an As Late As Possible task.