Spoken Dialogue Systems Kristiina Jokinen and Michael McTear (University of Helsinki, University of Ulster) Princeton, NJ: Morgan & Claypool (Synthesis Lectures on Language Technologies, edited by Graeme Hirst, volume 5), 2009, xiv+151pp; paperback, ISBN 978-1-59829-599-3, $40.00; ebook, ISBN 978-1-59829-600-6, doi 10.2200/S00204ED1V01Y200910HLT005, $30.00 or by subscription