Affect / Effect / Effect (verb)
Different formsAffect is usually a verb meaning influence; effect is usually a noun meaning result. Effect is also a valid formal verb meaning bring about.
Affect
Use when
You usually need a verb meaning influence or change something.
Example
“The delay may affect the implementation date.”
Effect
Use when
You usually need a noun meaning a result or consequence.
Example
“The delay had no effect on service delivery.”
Effect (verb)
Use when
You mean bring about or cause a result, usually in formal writing.
Example
“The new operating model will effect a lasting change in service delivery.”
Quick check
have an affect on, may effect the outcome
Usage note