Rationale / Rational
Different formsRationale is a noun meaning the underlying reasons; rational is an adjective meaning based on reason. Explain the rationale for a rational decision.
Rationale
Use when
You need the noun for the reasons or reasoning behind a decision, proposal or action.
Example
“The paper explains the rationale for extending the pilot.”
Rational
Use when
You need the adjective meaning based on reason, logical or sensible.
Example
“Extending the pilot is a rational response to the new evidence.”
Quick check
the rational for, the rational behind, a rationale decision
Usage note