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Trying to get a handle on large or complex datasets is not always easy or straightforward. Excel, the vehicle of choice for many people doing basic data analysis, simply doesn't cut it. And whereas there are plenty of data mining and knowledge discovery tools to chose from, many of these are designed to run in batch mode. For those interested in iteratively exploring data - in order to understand it, to extract features or discover new knowledge - the needs for interaction are essential. This is the area that Processing, (http://processing.org), seeks to address. Processing is an open-source programming language and environment for processing data and creating innovative and interactive displays for data mining and exploration.