Recently I took part in a conversation about the difference between the many hats of a successful corporate executive, and multiple personality disorder. Although humorously bantered, the ideas shared in that conversation shed a light on the fuzziness between when consistent multiplicity of personality characteristics is useful and good (to better adapt to a variety of environments), and when is it counter-productive or self-defeating, and labeled multiple personality disorder? What are the cross-over points?  Multi-tasking in executive management positions require being able to speak in the vernacular of many stake holders and to be able to communicate effectively with a wide variety of groups and collaborators. Corporate cultures vary between industries, countries, even regions, and size of the enterprise, etcetera, and yet, a successful corporate executive can walk in any of these with ease. How can the effective use of these chameleon expressions be distinguished from split personality?I use this example tongue in cheek, but Mitt Romney is the perfect example of someone whose personalities clashed in company with one another (fund raiser, 47% vs. 100%). He is a very successful businessman, did his changing faces in the media unravel a persona that didn't really exist? 
At what point do multiple personas for social context cross into multiple personalities disorder?
social psychology;abnormal psychology