Testing
Authorization letter
Also called: letter of authorization, LOA, testing waiver
An authorization letter is a signed statement from someone with authority over the target systems confirming that the named tester may perform the described testing during a specified window. It is the tester's legal basis for the work.
See also
Testing, with the report an auditor can actually use
A fixed price, a date, and a report that states scope, method and closure. No discovery call required to get a number.