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TADA-Ed stands for Tool for Advanced Data Analysis in Education. It is a data mining platform dedicated to teachers, allowing them to visualize and mine students on-line exercise work with the aim of discovering pedagogically relevant patterns. Most of the time, prior to mining, the data stored in a database needs some transformation. TADA-Ed contains pre-processing facilities so that users can transform the database tables to a format that, when used with a particular data mining algorithm, can generate meaningful results for the teacher. We show an application using students' mistakes recorded during exercises from a web-based tutoring tool.