Polyfragmented

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Polyfragmented systems have large amount of fragments, often due to severe or pervasive trauma. Common traits within polyfragmented systems are:
 * Complex internal structures like subsystems, sidesystems, and layers
 * Active and detailed inner worlds
 * Co-consciousness being more frequent
 * A relatively small fronting group
 * Lack of non-dissociative coping mechanisms
 * Splitting easily, both during and after trauma, and splitting multiple fragments at once
 * A number of "well defined" alters that may be similar to non-polyfragmented systems
 * Trauma that was integrated into day-to-day life

Other qualities of polyfragmented systems that are less universal are obsessive symptoms, divisions based on time period of splitting (epochs) , mass introjection , and purposeful exploitation of dissociative responses by abusers.

Multiple numbers have been given for the minimum number required to be a polyfragmented system; anything from "dozens", 26 , 50+ to at least 100, which is why the exact number of alters is less relevant than the other symptoms listed above.

Common definitions of polyfragmention shorten it to "100+ alters"; this is a simplification.

History
Originally, "complex" and "polyfragmented" were separate terms originating from separate researchers.

"Polyfragmented" originates from Bennett G. Braun in 1986, specifying 100+ parts, most of which are one dimensional.

Richard Kluft defined and studied "complex MPD" in his paper The Phenomenology and Treatment of Extremely Complex Multiple Personality Disorder from 1988 focusing on a little over two dozen cases, despite first being introduced in 1979. The minimum number for his definition is 26, coming from double the upper modal number of alters in a system he found from an earlier study. (Kluft admits it is an arbitrary number.) It covers common patterns within complex systems, treatment outcomes, and highlights some of the cases that exemplify certain points. The paper even includes a table highlighting commonalities.

Eventually, these terms merged into one, but favoring the latter's title (possibly because of the emergence of the Complex Dissociative Disorder label creating a redundancy). The term "super multiple" has appeared in community literature with no known origin as well.

Related Terms
Polyfractal is a term for systems that have an even larger number of headmates than most polyfragmented systems, but is not commonly used, as polyfragmented does not have an upper limit. When a system has many non-fragments, they may prefer polymultiple. For median systems, polyfaceted is a similar term. Polyplural encompasses all of these.