Language Development in Exceptional Circumstances is an excellent review of thirteen different "experiments of nature" each exploring a particular deviation from the typical language-learning circumstances, and its effects on the development of language. [It] succeeds in presenting a great deal of potentially disparate information in a coherent and usable fashion, and should be of value to both practitioners and theoreticians in the field of language development. - Susan Goldin-Meadow, University of Chicago, Language and Speech.