The validity and effect of naming beneficiaries of retirement and other investment accounts is governed by 20 Pa.C.S. Ch. 64, and is not testamentary, so an agreement to name a person as the beneficiary of those accounts was not governed by 20 Pa.C.S. 2701 (contracts concerning succession) and did not need to be in writing. The agreement between the decedent and the beneficiary was supported by consideration and the conduct of the parties showed an intent to contract, so the failure of the decedent to maintain the necessary beneficiary designation resulted in damages payable by the estate (which received the retirement benefits by default) to the beneficiary. Glass v. Estate of Jeffrey A. George, 1454 MDA 2024 and 1472 MDA 2024 (Pa. Super. 9/8/2025) (non-precedential).