Findings suggest that Piper and Merskey made a number of errors in logic and scholarship in their two papers, as well as numerous examples of these errors that fit within different categories. The key examples of each main class of error include arguments that are not relevant to the diagnostic validity of DID, concluding that DID is not reliable and is spuriously related to trauma without examining the relevant data, the absolute conclusion that there is no evidence that the childhood trauma reported by people with DID actually occurred, and the claim that psychotherapy for DID is typically harmful without reviewing the relevant literature. These erroneous statements made by Piper and Merskey are presented in the paper with a discussion of why each is in fact an error of logic and scholarship. This available evidence supports the inclusion of DID in a future edition of the Diagnostic and Statistical Manual of Mental Disorders. References