Example of Serial Execution

To expedite processing of purchase orders, every line item in an order is forwarded to a different user for first level verification of item availability, price et cetera. The complete order can be processed only if all line items are approved. The line items are forwarded for approval sequentially. If any item is not approved, then the document is forwarded to the manager for approval. This process is depicted in the following figure.

Process Example for Serial Execution