"Proven" is the preferred past participle and adjective in American English; "proved" is the simple past and the BrE past participle.
Past participle of "prove" in American English, or an adjective describing something already demonstrated. As an adjective, always comes BEFORE a noun: "a proven method". As an AmE participle: "it has been proven".
This is a proven strategy for increasing customer retention in the retail industry.
The defendant has not yet been proven guilty beyond a reasonable doubt. (AmE)
She has a proven track record of delivering results under tight deadlines.
Simple past of "prove" in both varieties: "She proved her theory." In British English, also the past participle: "It has been proved." In AmE, "proved" as a participle is less common than "proven".
He proved his critics wrong by delivering the project ahead of schedule.
Scientists proved the hypothesis through a series of controlled experiments.
The theory has been proved beyond doubt by multiple independent researchers. (BrE)
Common mistake
The only case where "proven" is required: when it functions as an adjective before a noun. "A proved method" sounds odd in any variety: the correct form is "a proven method". As a participle with "have", both are accepted in AmE, but "proven" is more common. For the simple past, always "proved": "She proved it" (never "She proven it").
Trick to remember it
Before a noun as an adjective: always PROVEN ("a proven method", "proven results", "a proven record"). Simple past: always PROVED ("he proved it", "she proved the theory"). As a participle with "have": PROVEN in AmE, PROVED in BrE (both correct).
Quick rule
Proven = adjective before noun (proven method) + preferred AmE participle. Proved = universal simple past (she proved it) + preferred BrE participle.
Did you know?
"Proven" is a borrowing from Scottish legal language ("proven" in Scottish verdicts: "guilty", "not guilty", or "not proven"). In the Scottish legal system, "not proven" is a special verdict meaning there is insufficient evidence to convict, but without declaring full innocence. This Scottish legal use is what introduced "proven" into general English as an alternative participle.
Exercise 1 · Pick the right one
The new drug is a _____ treatment for this type of infection, backed by twenty years of clinical trials.
Exercise 2 · Pick the right one
She _____ everyone wrong when she launched the product and it immediately sold out.
Exercise 3 · Form the word
Proven = adjective before noun (proven method) + preferred AmE participle. Proved = universal simple past (she proved it) + preferred BrE participle.
The only case where "proven" is required: when it functions as an adjective before a noun. "A proved method" sounds odd in any variety: the correct form is "a proven method". As a participle with "have", both are accepted in AmE, but "proven" is more common. For the simple past, always "proved": "She proved it" (never "She proven it").
Before a noun as an adjective: always PROVEN ("a proven method", "proven results", "a proven record"). Simple past: always PROVED ("he proved it", "she proved the theory"). As a participle with "have": PROVEN in AmE, PROVED in BrE (both correct).
Bryan López
Founder of SpeakUP Academy