The phrase 'proved its effectiveness' is correct and perfectly usable in written English.
You can use it when referring to an action, idea, or tool which has been demonstrated to be successful or effective. For example: "The new marketing campaign proved its effectiveness when it resulted in a 20% increase in sales."
It proved its effectiveness on 7 March 1933, when a non-radio de Havilland DH.60 Moth of British Air Transport failed to arrive at Lympne.
The phenomenon of citizens groups autonomously coordinating strategy sounds arcane, but it has proved its effectiveness.
The proposed generation algorithm based on SSO has proved its effectiveness by evaluating it against other algorithms.
Hospitals should offer heated chemotherapy — and insurance companies should pay for it — only after controlled trials have proved its effectiveness.
This approach proved its effectiveness in Libya last year.
And the system proved its effectiveness by detecting the relatively low-yield nuclear explosions conducted by North Korea.
But when it was rejected by the FDA for a lack of adequate data proving its effectiveness, it's creators Sprout Pharmaceuticals re-examined it when trials found some women experienced a slight increase in sexual desire.
And it may turn on the interpretation of an arcane Food and Drug Administration regulation that allows manufacturers to put a device on the market without rigorously proving its effectiveness when it is intended to treat or diagnose a fairly rare condition.
The questionnaire was pre-tested in a village outside the study sites to prove its effectiveness before it was applied.
This may be a potential confounding factor for the appearance of a MH, because this technique, although it has proven its effectiveness, can induce MH in eyes with very thin foveola [ 34, 37].
The gubernatorial candidate has also cast doubt on Head Start, saying that it hasn't proven its effectiveness and that the federal government should rethink the funds it has dedicated to the program.
