Eric Lauer, epidemiologist at the Institute on Disability at the University of New Hampshire, USA presented a seminar at SDHI. He highlighted the complex challenges to produce accurate, inclusive and meaningful data in the context of national health and community surveys. In his presentation he provided examples from widely used and cited US data sources, including the Census, American Community, Medical Expenditure Panel and National Health Interview Survey. He discussed sources and processes of exclusion and the risk for bias. Uncritical use of the data may lead to policy solutions that are not representative of the population they intend to address. Due to a sound error we are unable to post the video of the presentation. Our apologies. Please see the slide presentation below.