Microsoft Office Tutorials and References
In Depth Information
Setting task constraints
sometimes called soft constraints or moderate constraints . When a semi-flexible
constraint has been applied to a task, Project displays a special indicator in the
Indicators column.
In total, there are eight types of task constraints.
This constraint
category
Includes these
constraint types And means
Flexible
As Soon As
Possible (ASAP)
Project will schedule a task to occur as soon as it can occur.
This is the default constraint type applied to all new tasks
when scheduling from the project start date. There is no
constraint date for an ASAP constraint.
As Late As
Possible (ALAP)
Project will schedule a task to occur as late as it can occur.
This is the default constraint type applied to all new tasks
when scheduling from the project finish date. There is no
constraint date for an ALAP constraint.
Semi-flexible
Start No Earlier
Than (SNET)
Project will schedule a task to start on or after the
constraint date you specify. Use this constraint type to
ensure that a task will not be scheduled to start before a
specific date.
Start No Later
Than (SNLT)
Project will schedule a task to start on or before the
constraint date you specify. Use this constraint type to
ensure that a task will not start after a specific date.
Finish No Earlier
Than (FNET)
Project will schedule a task to finish on or after the
constraint date you specify. Use this constraint type to
ensure that a task will not finish before a specific date.
Finish No Later
Than (FNLT)
Project will schedule a task to finish on or before the
constraint date you specify. Use this constraint type to
ensure that a task will not finish after a specific date.
Inflexible
Must Start On
(MSO)
Project will schedule a task to start on the constraint date
you specify. Use this constraint type to ensure that a task
will start on an exact date.
Must Finish On
(MFO)
Project will schedule a task to finish on the constraint date
you specify. Use this constraint type to ensure that a task
will finish on an exact date.
These three constraint categories have very different effects on the scheduling of tasks:
Flexible constraints , such as As Soon As Possible (ASAP), allow tasks to be scheduled
without any limitations other than their predecessor and successor relationships,
and the project’s start date (for ASAP task constraints) or finish date (for As Late As
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