Microsoft Office Tutorials and References
In Depth Information
Setting task constraints
Task 16 is rescheduled to start on July 17 instead of July 15. All tasks that depend
on task 16 are also rescheduled. One way to view this rescheduling is by the light
blue change highlighting that Project applies to the Start and Finish dates of the
successor tasks of task 16. Because the durations of the 1st Pages review and Design
and Production summary tasks were also changed by applying the constraint to
task 16, the Duration and Finish fields for those summary tasks are also highlighted.
Change highlighting remains visible until you perform another editing action or save
the file, and it is an effective visual way to see the broader effects of your specific
actions in your schedule.
8 Click the Close button (the “X” button in the upper-right corner) on the Task
Here are a few other things to keep in mind when applying constraints to tasks:
▪ Entering a Finish date for a task (for example, in the Finish column) applies a Finish
No Earlier Than constraint to the task.
▪ Entering a Start date for a task (for example, in the Start column) or dragging a Gantt
bar directly on the Gantt chart applies a Start No Earlier Than constraint to the task.
▪ In many cases, entering a deadline date is a preferable alternative to entering a
semi-flexible or inflexible constraint. You will work with deadline dates in Chapter 10.
▪ Unless you specify a time, Project schedules a constraint date’s start or finish time
using the Default Start Time or Default End Time value on the Schedule tab of the
Project Options dialog box. (To open this dialog box, on the File tab, click Options.)
In this project, the default start time is 8 A.M. If you want a constrained task to be
scheduled to start at a different time, enter that time along with the start date. For
example, if you want to schedule a task to start at 10 A.M. on July 16, enter 7/16/15
10AM in the Start field.
▪ To remove a constraint, first select the task or tasks and, on the Task tab, in the
Properties group, click Information. In the Task Information dialog box, click the
Advanced tab. In the Constraint Type box, select As Soon As Possible or (if scheduling
from the project finish date) As Late As Possible.
▪ If you must apply semi-flexible or inflexible constraints to tasks in addition to task
relationships, you might create what is called negative slack . For example, assume
that you have a successor task that has a finish-to-start relationship with its
predecessor task. If you enter a Must Start On constraint on the successor task earlier than
the finish date of the predecessor task, this results in negative slack and a scheduling
conflict. By default, the constraint date applied to the successor task will override the