Drafting convention check: Should a heavy straight underline be drawn beneath all dimension values that are “to scale,” or is that not a standard practice in modern technical drawings?

Introduction / Context:
Dimensioning communicates the true intended size of features regardless of drawing scale. Conventions like underlining, brackets, or special symbols exist in some legacy contexts, but current standards emphasize clarity without unnecessary adornments. This question tests whether underlining all “to scale” dimensions is recommended practice.

Given Data / Assumptions:

• Modern drawings show true sizes with dimension text, independent of graphic scale.
• “Not to scale” conditions are typically indicated by general notes or local annotations, not by underlining all other values.
• Heavy underlines can add clutter and are not part of mainstream standards for normal dimensions.

Concept / Approach:
Dimensions are authoritative; the model or drawing graphics are secondary. Whether or not a drawn view is perfectly scaled, the numerical dimension stands as the requirement. As a result, standards do not call for a heavy underline under every dimension that happens to be graphically to scale. Instead, atypical conditions (e.g., NTS) are explicitly noted.

Step-by-Step Solution:
Recognize that dimension text defines requirement, independent of graphic scale.Identify that highlighting “to scale” values is unnecessary and nonstandard.Note that special cases (reference or NTS) are handled with notes/symbols, not bulk underlining.Conclude the proposed heavy underline practice is not standard—statement is incorrect.

Verification / Alternative check:
Review drafting guides: dimensions are presented plainly; exceptions are called out specifically rather than underlining normal conditions.

Why Other Options Are Wrong:
“Correct” conflicts with standard practice. Use in architecture, reduced scales, or inspection-critical dimensions does not establish a universal rule.

Common Pitfalls:
Over-annotating drawings; mixing up legacy shop-floor markings with formal drafting standards.

Final Answer:
Incorrect