Dimensioning policy for assemblies: As a rule, assembly drawings are usually not fully dimensioned; only key overall, interface, and fit dimensions are shown, while individual part dimensions appear on detail drawings. Assess this statement.

Introduction / Context:
Drawing packages typically include both assembly and detail drawings. Knowing which dimensions belong where improves clarity and avoids duplication or contradiction. Assemblies emphasize relationships and fits; details carry complete manufacturing information for each part.

Given Data / Assumptions:

• We are discussing production documentation, not conceptual schematics.
• Detail drawings exist for manufactured components.
• Assemblies must communicate how parts relate and interface.

Concept / Approach:
Assembly drawings focus on mating conditions, reference datums, installation envelopes, overall size, and critical interfaces (bolt circles, clearances, shaft-to-bore fits). Detail drawings (or model-based definition) provide all feature sizes, tolerances, and finishes for individual parts. This division of information prevents conflicting numbers and keeps the assembly sheet readable.

Step-by-Step Solution:

Verification / Alternative check:
Compare a fully dimensioned assembly to a best-practice assembly. The best-practice version is cleaner, with only key dimensions, while the part details contain exhaustive size and tolerance data.

Why Other Options Are Wrong:

• Putting every part dimension on the assembly (option B) creates clutter and conflicts.
• Asserting “no dimensions at all” (option C) ignores necessary installation and fit dimensions.
• Parts lists (option D) are not a place for numeric geometry.
• Exploded views (option E) are pictorial aids, not the home for all dimensions.

Common Pitfalls:
Duplicating dimensions across assembly and detail sheets; omitting critical interface tolerances; failing to note reference datums that drive assembly inspection.

Final Answer:
Correct: assemblies show limited critical dimensions, not full detail