Measurement systems Which system of units is based on inch–foot–yard measurements and is widely used in the United States for everyday and many engineering applications?

Introduction / Context:
Engineering drawings and specifications must clearly indicate the measurement system to avoid errors. In the United States, many sectors still specify dimensions in inches, feet, and yards—the U.S. customary system.

Given Data / Assumptions:

• Length units: inch, foot, yard (and mile).
• The alternative is the metric SI system (millimeter, centimeter, meter).
• Some projects are fully metric, but many legacy and civil projects remain customary.

Concept / Approach:
Associate the named system with its base units. If inch–foot–yard are named, the correct label is U.S. customary units. ISO international units correlate with SI (metric), not inch–foot–yard.

Step-by-Step Solution:

Verification / Alternative check:
Standards documents and textbooks list customary conversions (12 inches = 1 foot, 3 feet = 1 yard) under the U.S. customary system.

Why Other Options Are Wrong:

• International customary and ISO international units are not standard names for inch–foot–yard; ISO aligns with SI.
• U.S. metric units: Not applicable because the base units given are imperial/customary, not metric.

Common Pitfalls:
Mixing metric and customary units within the same dimension chain can cause conversion mistakes; keep drawings consistently in one system or clearly dual-dimensioned.

Final Answer:
U.S. customary units