"Visualizing Data" is an intensive five-day workshop where participants practice the trade of data visualization. Visualization will be taught as a design process: In order to design effective visualization one needs to have a clear communication purpose in mind, know the audience, know a wide range of visualization idioms, be fluent in the tools required to transform imagination into a finished product, and be able to evaluate the effectiveness of the visualization. This broad range of skills requires for an integration of theory and practice. Participants will learn about visualization theory, including human perception, marks and channels, the visualization design process, and best practices. They will create their own visualizations given a question and a dataset, recreate, criticize and improve upon existing visualizations, and – supported by the group and the lecturer – work on their own visualization project.