A will comprising a single document executed by two or more persons as the will of all of them. It is treated as the separate will of each testator, and probate will be granted separately on the death of each. A joint testator may revoke the will only insofar as it applies to himself. A joint will is a convenient instrument for the exercise of a power conferred on persons jointly to appoint by will (see power of appointment) but has no other practical benefit and is extremely rare in practice. Compare mutual wills.