It is our great pleasure to welcome you to the 2nd International Workshop on Spoken Dialogue Systems Technology (IWSDS), which was held, as a satellite event of INTERSPEECH 2010, at Gotemba Kogen Resort in the Fuji area, Japan, October 1 2, 2010. The annual workshop brings together researchers from all over the world working in the ?eld of spoken dialogue systems. It provides an international - rum for the presentation of research and applications and for lively discussions among researchers as well as industrialists. Building on the success of IWSDS 2009Irsee, Germany, thisyear sworkshopdesignated SpokenDialogueSystems for Ambient Environments as a special theme of discussion. We also enco- aged discussions of common issues of spoken dialogue systems including but not limited to: Speech recognition and semantic analysis Dialogue management Adaptive dialogue modelling Recognition of emotions from speech, gestures, facial expressions and ph- iological data User modelling Planning and reasoning capabilities for coordinationand con?ict description Con?ict resolution in complex multi-level decisions Multi-modality such as graphics, gesture and speech for input and output Fusion and information management Learning and adaptability Visual processing and recognition for advanced human-computer interaction Databases and corpora Evaluation strategies and paradigms Prototypes and products The workshop program consisted of 22 regular papers and 2 invited keynote talks. This year, we were pleased to have two keynote speakers: Prof. Ram on L opez-C ozar, Universidad de Granada, Spain and Prof. Tetsunori Kobayashi, Waseda University, Japan."