To control subclasses extensions. You can define a template method that calls "hook" operations at specific points, thereby permitting extensions only at those points.
The tolerance dimension is the time available to fulfill a request from a user. Tolerance is closely bound with the overall perceived performance.
Tolerance can increase performance, scalability, reliability, and manageability.
The workload dimension is the computational work being performed at a particular point within the system. Workload is closely related to capacity in that workload consumes available capacity, which leaves fewer resources available for other tasks.
Workload can increase performance, scalability, and availability.