Jointly owned property with right of survivorship:

may be given away by the survivor during his life, but he still owns the property when he dies, the property passes according to the will of the first owner to die

must be left by the survivor to someone on the list of beneficiaries as indicated in the will of the first owner to die

passes according to an agreement made by the first to die and the survivor, and is specified in the survivor's will

passes according to the survivor's will at his death, but still poses potential issues including double taxation