It's saying that the operation can be made parallel. Applying an operation to a total workload is identical to: 1) Split the total workload into smaller workl

It's saying that the operation can be made parallel. Applying an operation to a total workload is identical to: 1) Split the total workload into smaller workloads. 2) Apply the operation to each smaller workload. 3) Apply the operation to the results from step 2. Each smaller workload in step 2 can be run in parallel. While that may seem obvious for adding numbers or money it may be less obvious when you have different operations for example a method in an OO class hierarchy.