 There is currently no consensus about the appropriate resolution of these problems. In particular, there is no consensus about whether the adoption of counterpart theory is superior to the solutions available to a transworld identity theorist. A full examination of the issue would require a discussion of the objections that have been raised against counterpart theory as an interpretation of de re modality. And a detailed discussion of counterpart theory is beyond the scope of this article. (For David Lewis’s presentation of counterpart theory, the reader might start with Lewis 1973, 39–43, followed by (the more technical) Lewis 1968. Early criticisms of Lewis’s counterpart theory include those in Kripke 1980; Plantinga 1973; and Plantinga 1974, Ch. 6. Lewis develops the 1968 version of his counterpart theory in Lewis 1971 and 1986, Ch. 4; he responds to criticisms in his “Postscripts to ‘Counterpart Theory and Quantified Modal Logic’” (1983, 39–46) and in Lewis 1986, Ch. 4. Other discussions of counterpart theory include Hazen 1979, the relevant sections of Divers 2002, Melia 2003, and the more technical treatment in Forbes 1985. More recent critiques of the theory (postdating Lewis’s 1986 response to his critics) include Fara and Williamson 2005, Fara 2009, and Dorr, Hawthorne, and Yli-Vakkuri 2021, Ch. 10.)