When you enter a task’s actual start date, Project moves the scheduled start date to match the actual start date .
When you enter a task’s actual finish date, Project moves the scheduled finish date to match the actual finish date and sets the task to 100% complete.
When you enter a task’s actual work value, Project recalculates the task’s remaining work value, if any .
When you enter a task’s actual duration, if it is less than the scheduled duration, Project subtracts the actual duration from the scheduled duration to determine the remaining duration .
When you enter a task’s actual duration, if it is equal to the scheduled duration, Project sets the task to 100% complete .
When you enter a task’s actual duration, if it is longer than the scheduled duration, Project adjusts the scheduled duration to match the actual duration and sets the task to 100% complete .