 "In all cases known, the language consists of onomatopoeic expressions, some neologisms, but for the greatest part of words from the adult language adapted to the constrained phonological possibilities of young children.These words being hardly recognizable, the language may turn out to be completely unintelligible to speakers of the parents' languages, but they resemble each other in that they lack morphology and that word order is based on pragmatic principles such as saliency and the semantic scope of words.Neither the structure of the languages nor its emergence can be explained by other than situational factors."