Shop drawings are typically derived from design drawings. Which option best describes this relationship?

• A. They are independent of design drawings
• B. They are derived from shop tickets
• C. They are generated from design drawings
• D. They replace design drawings

Answer: (C)

In fabrication, design drawings lay out the overall plan and intent for a part or assembly, while shop drawings are created to translate that plan into detailed, fabrication-ready instructions. Shop drawings are generated from design drawings to specify exact parts, dimensions, material thickness, bends, holes, welds, fasteners, tolerances, and assembly sequences that the shop will use to manufacture and assemble components. They adapt the design to real-world fabrication needs and project specifics, but they do not alter the original design intent.

They are not independent of design drawings, nor are they produced from shop tickets, which track work already performed. They also do not replace design drawings—the design drawings remain the authority, with shop drawings providing the detailed execution plan to build as designed.