This book brings forth an analysis and assessment of acoustic waves and devices. Acoustics is an advanced field which enjoys a never ending youth and novel innovations in this field are introduced by either the search for a better comprehension, or by technological innovations. Micro-fabrication methodologies introduced a complete novel class of microdevices, which exploit acoustic waves for several different tasks, specifically for sensing purposes and information processing. Performance enhancements are achievable by optimized modelling tools, which are able to deal with more complicated configurations, and through more enhanced strategies of fabrications and of integration in technological systems, for example wireless communications. This book primarily deals with analysis and models of acoustic devices its theoretical studies and modelling strategies; and the measurement techniques which explore the properties of broadly distinct systems.