1. An apparatus for analyzing touch screen users based on characterization of features derived from a touch event, the apparatus comprising: a touch sensitive screen for detecting a touch event from at least one user, said touch sensitive screen having at least two touch regions; at least one sensor generating a vibro-acoustic waveform signal from the touch event; a converter for converting the waveform signal into a domain signal; a feature extractor for extracting distinguishing features from said domain signal; and a plurality of classification units which use the distinguishing features of said extractor to analyze the features of the domain signal, at least one such classification unit associated with at least one such touch region and another such classification unit associated with another such touch region.