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Steps 2 - 7 constitute what is often called data mining. Although the steps are listed in a specific order, data mining is not really a linear process. It is often necessary to revisit earlier steps. For example, when you build a model, you may discover that the data that you are using isn't quite right. Correcting problems with the data may require revisiting the data understanding and data preparation steps. You may iterate among the following steps several times: