In an earlier paper (Ackner, 1954) various aetiological approaches to the problem of depersonalization were examined and no common agreement was found. The salient phenomena of depersonalization were examined and found to be so lacking in precision that no clear-cut boundaries could be considered to exist. This explained the lack of any truly adequate definition of depersonalization and suggested that some of the past disagreements had been the result of failure to make explicit the phenomena under discussion.