Which element appears last in the standard work number sequence?

• A. project type
• B. engine type
• C. customer
• D. serial number

Answer: (D)

A standard work number is built from broad to specific. You define the project scope first, then the engine variant, then the customer. The final piece is the serial number, which uniquely identifies the individual unit. Because the serial number is the true unique identifier for one item, it comes last after the other descriptive elements. The project type, engine type, and customer organize and categorize the work, while the serial number distinguishes the final unit.