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There are three factors involved in text classification: the classification model, the similarity measure, and the document representation. In this chapter, we will focus on document representation and demonstrate that the choice of document representation has a profound impact on the quality of the classification.We will also show that the text quality affects the choice of document representation. In our experiments we have used the centroid-based classification, which is a simple and robust text classi-fication scheme. We will compare four different types of document representation: N-grams, single terms, phrases, and a logic-based document representation called RDR. The N-gram representation is a string-based representation with no linguistic processing. The single-term approach is based on words with minimum linguistic processing. The phrase approach is based on linguistically formed phrases and single …