Objective
EROS is a 4-year prospective study across Europe that will develop methods and collect data in European populations to estimate the impact of stroke and assess the quality of stroke care. The main objective is to understand the factors underlying variations in the quality of care and outcome after stroke. The strength of the study is the detailed clinical and healthcare information that will be collected from unbiased population registers using standardised, novel, data collection methods. The data will be able to answer unresolved issues with regard to the influence of sociodemographic, case mix and stroke healthcare quality factors on the variations in health of stroke patients around Europe. Refinement of methodologies to estimate quality, health related quality of life and health economic impact of this disease of public health importance would aid researchers and health care planners.