You assigned a task calendar, but it's not scheduling tasks in all the times it should
The task probably also has a resource assigned, and the resource calendar is conflicting with what you want the task calendar to accomplish.
When you assign a task calendar, it takes the place of the project calendar. However, suppose resources are assigned to the task as well. Resources are all associated with their own resource calendars as well. Although a resource's calendar might be the same as the project calendar, it can be customized for the resource's specific working times.
When resources are assigned, the task is scheduled not just for the working times indi cated in the task calendar. Instead, by default, Microsoft Project schedules the task accord ing to the common working times between the task calendar and the resource calendar.
For example, suppose the 24-hour base calendar is assigned to a task that's also assigned to a resource who works Friday through Sunday, 9:00 A.M. until 7:00 PM. The only times the two calendars have in common are Friday through Sunday, 9:00 A.M. until 7:00 PM., so by default, those are the only times when work will be scheduled for this task.
If you want the resource calendar to be ignored on a task, open the Task Information dialog box for the task and click the Advanced tab. Select the Scheduling Ignores Resource Cal endars check box.
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What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.