Agreement plays a pivotal role in the generative theory of natural language. More recently, the minimalist paradigm suggests positing a separate operation: Agree – for agreement, alongside Merge – the recursive structure building operation, and Move – the displacement operation in grammar. Though Agree, it would seem, is well-supported by ample empirical data, there is reason to doubt the existence of such an operation in grammar. The advent of minimalism in linguistic theory necessitates doubting all attributes of the language faculty that seem unique to it. If language is part of cognition, the rest of cognition should be reflected in its workings, thus ruling out the possibility of the language organ standing out for being too idiosyncratic. Agree is very language-specific and yet the literature that readily accepts it hardly ever tries to locate it within the cognitive domain. This book makes an effort in this direction and shows that this operation is not conceptually necessary to the language system. It cannot be justified on general economy considerations. Alongside these conceptual arguments, the book also takes up long-distance agreement constructions from languages as diverse as Basque, Chamorro, Chukchee, Hindi-Urdu, Icelandic, Innu-aimun, Itelmen, Japanese, Kashmiri, Passamaquoddy and Tsez to show that what seemingly appear as evidence for Agree at first glance, on closer inspection, turn out to be instances of local, sisterhood relations in grammar.(Dis)Agree: Exploring Agreement Mechanisms will interest linguists and cognitive scientists, especially students and scholars of syntactic theory and the mind-language interfaces at graduate level and above.