Similarly, if a person comes to you claiming to have DID, treat them with respect. You are not a doctor, and you don't know what the label means. However, anyone diagnosed with DID has a lot more going on than multiple personalities. According to all professional standards, having multiple personalities is not sufficient reason to apply any diagnosis whatsoever in and of itself. Respect that they may have additional concerns and needs.
== Alters ==
In practise, most alters experience communication difficulties. This means they cannot read each others thoughts, they cannot watch each other, and they cannot both be active in order to talk to each other at the same time. This leads to amnesia, where one personality fails to remember what happened while another one was active. They also usually experience control difficulties, where they cannot control who is out in front, and can be pushed to the front through the use of trigger words. A side effect of this is they can almost always switch.
== History ==
The diagnosis was largely created in the eighteen hundreds, at a time when efforts to standardise psychological diagnosis were underway. The subject of multiple personalities were discussed amongst psychologists as a topic of fascination. Around this time, it became recognised that traumatic events could indeed cause long lasting mental harm.
Around the start of the nineteen hundreds, interest in this topic began to wane. This is most likely because the condition was seen as very rare, though accusations of fraud also factored in. Around this time, the diagnosis of Schizophrenia was broadened to be more inclusive, capturing much of what dissociative identity disorder was. This overbroadening of Schizophrenia persisted and got worse, mainly in the united states, but has since been largely rectified, with the creation of a new category of dissociative disorders, one that contains DID, as well as PTSD and similar, and stricter diagnostic standards for Schizophrenia.
In 1957, a book called The Three Faces of Eve, was published, and created a resurgence in the popularity of the diagnosis. In it, in dramatic fashion, was the depiction of "eve", a person with three personalities. This was further strengthened by the story of "Sybil" (real name Shirly Ardell Mason). Despite a sudden jump in the number of people with this diagnosis, more books, and more research, the diagnosis again died amongst rumours of fraud and fakery.