The CODATA Series "Data and Knowledge in a Changing World" collects the wealth of information pertaining to the intelligent exploitation of data in the conduct of science and technology. The scope of the series encompasses a broad range of fields, including medical fields in accordance with CODATA's own aims. In an evolving information world, in which traditional ways of communicating information are changing, this series will capture emerging and innovative concepts for validation, visualization, etc. of data. Contributions are commissioned by CODATA's publication committee.