Microsoft Office Project 2003 uses the following types of calendars (calendar: The scheduling mechanism that determines working time for resources and tasks. Project uses four types of calendars: the base calendar, project calendar, resource calendar, and task calendar.) to determine resource availability (availability: Indicates when and how much of a resource's time can be scheduled for assigned work. Availability is determined by project and resource calendars, resource start and finish dates, or the level at which the resource is available for work.) and the way tasks (task: An activity that has a beginning and an end. Project plans are made up of tasks.) are scheduled:
The calendar used to designate the default work schedule for all tasks in a project.
Tasks are scheduled based on the working times (working time: Hours designated in a resource or project calendar during which work can occur.) in the project calendar; however, you can customize the working times from the project calendar in a task calendar if you have tasks to be completed at different times, especially tasks that are independent of resources. A task calendar is especially useful for equipment that runs and completes tasks throughout nights or weekends, which is designated as nonworking time in the project calendar.
Project calculates when a resource and task are scheduled to work by using the calendars in the following order: project calendar, resource calendar, and task calendar. If a task has no resources and no task calendar, it's scheduled according to the project calendar. If a task has resources assigned and no task calendar, it's scheduled according to the resource calendars. You can set the task calendar to ignore the resource calendars if you need to schedule a task during a nonworking time for a resource. In the Task Name field, click the task with the task calendar that you want to override the resource calendars of any assigned resources. Click Task Information , and then click the Advanced tab. Select the Scheduling ignores resource calendars check box to have the task calendar override all applicable resource calendars.
Note The Project Working Times side pane provides an easy way to set the project's working times. On the Project Guide toolbar, click Tasks. Click Define general working times, and then follow the instructions that appear in the side pane.