Diambil dari Cambridge Dict:
Verification : at verify
Verify : to prove that something exists or is true, or to make certain that something is correct
Are you able to verify your account/allegation/report/theory?
Validation : at validate
Validate : to make something officially acceptable or approved, especially after examining it
The data is validated automatically by the computer after it has been entered.
effective : successful or achieving the results that you want
It’s an extremely effective cure for a headache.
efficient : working or operating quickly and effectively in an organized way
The city’s transport system is one of the most efficient in Europe.