Understanding Constraint Types

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The As Soon As Possible constraint is applied by default to all tasks in a project scheduled from the start date. In a project scheduled from the finish date, the As Late As Possible constraint is applied. The As Soon As Possible and As Late As Possible constraints are considered flexible constraints.

Note Different types of constraints are applied in certain situations, depending on whether you're working with a project scheduled from the start date or from the finish date. For example, entering a date in the Start field of a project scheduled from the start date causes a Start No Earlier Than constraint to be applied. Doing the same thing in a project scheduled from the finish date causes a Start No Later Than constraint to be applied.

When a task needs to be scheduled in relation to a specific date, there are additional constraints you can apply, each of which is associated with a date. The following is a list of all the date constraints you can use to refine your project schedule:

Start No Earlier Than (SNET) A moderately flexible constraint that specifies the earliest possible date that a task can begin. For projects scheduled from a start date, this constraint is automatically applied when you enter a start date for a task. Finish No Earlier Than (FNET) A moderately flexible constraint that specifies the earliest possible date that this task can be completed. For projects scheduled from a start date, this constraint is automatically applied when you enter a finish date for a task.

Start No Later Than (SNLT) A moderately flexible constraint that specifies the latest possible date that this task can begin. For projects scheduled from a finish date, this constraint is automatically applied when you enter a start date for a task. Finish No Later Than (FNLT) A moderately flexible constraint that specifies the latest possible date that this task can be completed. For projects scheduled from a finish date, this constraint is automatically applied when you enter a finish date for a task.

Must Start On (MSO) An inflexible constraint that specifies the exact date when a task must begin. Other scheduling controls such as task dependencies become secondary to this requirement.

Must Finish On (MFO) An inflexible constraint that specifies the exact date on which a date must be completed. Other scheduling controls such as task dependencies become secondary to this requirement.

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Project Management Made Easy

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