All human speech has expression. It is part of the 'humanness' of speech, and is a quality listeners expect to find. Without expression, speech sounds lifeless and artificial. Remove expression, and what's left is the bare bones of the intended message, but none of the feelings which surround the message. The purpose of this book is to present research examining expressive content in speech with a view to simulating expression in computer speech. Human beings communicate expressively with each other in conversation: now in the computer age there is a perceived need for machines to communicate expressively with humans in dialogue.