Dimensions are data sets that are used to represent certain situations or goals. Dimensions enable users to group data which represents these situations or goals within a single time period, such as a project plan, a target, a budget, or actuals. There are two system dimensions:
- Actual This dimension contains values that represent the actual amounts of dimensioned attributes. For example, posted timesheet time is included in the Actual dimension for assignments. The Actual dimension can be renamed, but not deleted.
- Plan This dimension is used for more detailed project planning. Values in the plan dimension reflect a more detailed knowledge of the program and project execution requirements. The Plan dimension includes task plans for a task based item, such as projects, as well as allocations for an activity-based item. The Plan dimension can be renamed, but not deleted.

Dimensions can be added to some (but not all) of the views that are available in the Projects and Reports modules. There are two dimensions types:
- Roll-up In a roll-up dimension, a parent item displays data that is rolled-up from a child itemm. Rolled-up data is read-only in the parent item. When data in the child item changes, data in the parent item changes too. If a child item becomes a parent item, original data in the child data is replaced by rolled-up data from a child item. Most dimensions are roll-up dimensions.
- Static In a static dimension, data is not rolled-up and there are no calculations. Data will be editable at any level of the parent/child hierarchy. Static dimensions are useful for top-down planning.
All security roles are given permission to view a dimension's item data. You can prevent all users in your organization from being able to view a dimension's item data by locking the dimension. Permission to edit a dimension's item data is granted on a per-security role basis for each dimension. To give permission to edit a dimension's item data, select the check box next to the security role. Permission to edit a dimension's item data is given to all security groups for a pre-configured dimension.
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