If the filing threshold has been met, or in other words, if, independent of the portability election, the estate is required to file an estate tax return based on the total value of the gross estate and adjusted taxable gifts, no extension of time to elect portability is available and Revenue Procedure 2017-34 does not apply.
Verification is the process of assuring that the product satisfies the conditions before work starts. Validation is the process of assuring that the product meets the specified requirements at the end of the development phase. In other words, to make sure the product is designed in accordance with customer's requirements.
Verification and validation are independent procedures that are used together for checking that a product, service, or system meets requirements and specifications and that it fulfills its intended purpose. These are critical components of a quality management system such as ISO 9000. The words verification and validation are sometimes preceded with independent, indicating that the verification and validation is to be performed by a disinterested third party.