D 580 (D Series)

Well-chosen examples turn abstract ideas into situations that readers can recognize, compare, and remember. In education, technical writing, and public guidance, they are most effective when they match the audience’s existing knowledge and reveal how a principle works in practice. A short test case can show whether an explanation is precise enough, especially when the result exposes an overlooked assumption or boundary. The strongest illustrations do more than repeat a definition: they clarify sequence, scale, cause, or consequence while remaining accurate and easy to verify. Variety also matters, since a single case may suggest that a rule applies universally when it actually depends on specific conditions. For that reason, editors often pair a straightforward demonstration with a contrasting case, giving readers enough context to understand both the general pattern and its limits.