I have not seen a thread about the Dissociative Experiences Scale (DES) here yet, so let's make one now. DES is a well validated screening instrument for assessing clients' degree of dissociation. Here is a link to an online version of the DES:
http://counsellingresource.com/lib/quiz ... tests/des/
The cut-off for prompting further assessment for DID is 30. Although only 17% of therapy clients who score over 30 have DID, most people who have DID do score over 30. That means a score below 30 is almost enough to rule out DID but a score over 30 only calls for further assessment.
Colin Ross has published a very detailed analysis of the DES here: http://www.rossinst.com/dissociative_ex ... scale.html