From the reviews of the second edition: This book highlights the importance of human factors in speech technologies, mainly speech-enabled applications. ! The publication of this second edition shows the success of the former volume. ! the book contains unique chapters showing different topics in the field of human factors in speech research and technology. ! Hopefully, the contributions in this second edition will convince the readers that human factors in speech technology are of continued importance in building more effective and natural solutions for human-machine interaction. (Gabor Olaszy, The Phonetician, Vol. 96, 2007)