Complexity in language : a multifaceted phenomenon / Salikoko S. Mufwene, Christophe Coupé, and François Pellegrino -- How to explain the origins of complexity in language : a case study for agreement systems / Luc Steels and Katrien Beuls -- Complexity in speech : teasing apart culture and cognition / Bart de Boer -- A complex-adaptive-systems approach to the evolution of language and the brain / P. Thomas Schoenemann -- Evolutionary complexity of social cognition, semasiographic systems, and language / William Croft / To what extent are phonological inventories complex systems? / Christophe Coupé, Egidio Marsico, and François Pellegrino -- A complexity view of ontogeny as a window on phylogeny / Barbara L. Davis -- Language choice in a multilingual society : a view from complexity science / Lucía Loureiro-Porto and Maxi San Miguel -- Complexity and language contact : a socio-cognitive framework / Albert Bastardas-Boada.