Match the word to the strength of the claim
Plausible means reasonable or believable, without implying proof. Conclusive describes evidence strong enough to settle a question. Tentative describes an idea, conclusion, or arrangement that may change. Substantial means large in amount, size, or importance; it does not automatically mean certain or final.
The explanation is plausible, but we need more data. The evidence is not conclusive. Our recommendation is tentative. The new system produced a substantial reduction in waiting time.
Preserve uncertainty accurately
Choose vocabulary that reflects what you actually know. A plausible explanation may later prove wrong. A tentative timetable may be revised. A substantial improvement can still have an uncertain cause. Write two versions of a claim: one based on early evidence and one appropriate only after decisive evidence is available.
Early evidence: The results suggest a plausible link between reminders and attendance. Decisive evidence: The investigation provided conclusive evidence that the damaged cable caused the outage.
Check your understanding.
Choose one answer for each question. You will see explanations after finishing.