Major advances in creating linear measures in education and the social sciences, particularly in regard to Rasch measurement, have occurred in the past 15 years, along with major advances in computer power. These have been combined so that the Rasch Unidimensional Measurement Model (RUMM) and the WINSTEPS computer programs now do statistical calculations and produce graphical outputs with very fast switching times. These programs help researchers produce unidimensional, linear scales from which valid inferences can be made by calculating person measures and item difficulties on the same linear scale, with supporting evidence. These computer programs are now available to all Learning Environment researchers. This book includes 13 Learning Environment research papers using Rasch measurement applied at the forefront of education with an international flavour.