In recent dielectric and calorimetric studies of some alcohol-water mixtures we have discovered unexpected and unexplained relaxation behaviours. Our aim with this proposal is to find structural explanations for these dynamical behaviours. In the case of glycerol-water and xylitol-water mixtures we would like to understand why two glass transition (Tg) temperatures are obtained in the intermediate or high water concentration range. For small amounts of added non-dissolvable water to 2-ethyl-1-hexanol we aim to investigate the size and shape of the water clusters in order to understand an exceptionally slow dielectric relaxation process. This proposal is central, and therefore of high importance, for the PhD student Khalid Elamin¿s thesis work on alcohol-water mixtures.