This report compiles the findings of the national Cohort studies that constituted an essential part of the project 'MOBILATE - Enhancing outdoor mobility in later life: Personal coping, environmental resources, and technical support' (Mollenkopf et al, 2003). The Cohort study was carried out in three of the participating countries (Finland, Germany, and Italy). The objective was to study the cohort differences of ageing people and the environmental changes affecting them between the years 1995-2000. We attempted to analyse the intra- and interindividual variability in mobility patterns by studying how the living conditions (sociostructural background, health, social network, outdoor mobility and activities) of the respondents, 55-59 and 75-79 year-old persons in 1995 and 2000 differ. The Cohort study has its origin in 1991 when the European COST A5 action (European Co-operation in the Field of Scientific and Technical research, Ageing and Technology) began. In the year 1994, a research project entitled "Keeping the elderly mobile: technology to meet their outdoor mobility needs" was initiated in Finland, Germany, Italy and the Netherlands (Mollenkopf & Marcellini, 1997; Mollenkopf, Marcellini, & Ruoppila, 1998; Tacken, Marcellini, Mollenkopf, & Ruoppila, 1999). The data gathered in Germany, Italy and Finland in 1995 and again in the context of the MOBILATE project in 2000 enabled us to study the individual and environmental differences between the first and second waves of assessment, including differences in travel behaviour, in health and social networks, and in the local environments. Because no common data-set was available from 1995, each participating research team carried out the research on the basis of the national data and thus is responsible for the national sections and the underlying analyses and interpretations, respectively. The following institutes and universities have contributed to the Cohort study: The German Centre for Research on Ageing at the University of Heidelberg (DZFA),