 This identification of the six elements of a sign is the clearest and least controversial part of Peirce’s final sign theories. Most of what we know about Peirce’s final account is gleaned from letters, partially worked out manuscripts and other miscellaneous items. Consequently, there is much to the final account that is still unclear, unsatisfactory, incomplete, and controversial. In this final section, we shall look at two of the most interesting issues surrounding the final account: Peirce’s projected Final Classification of sixty-six signs; and what appears to be his identification of additional interpretants.