More than five years have passed since Ohsawa proposed the concept of chance discovery [2]. When Ohsawa proposed the concept, data mining was already in boom and many researchers were starting, or absorbed in, studies on data mining. This trend seemed to be reasonable. The real lives of human are complex, and the future is not predictable. In order to have better or the best benefits, it is necessary to predict the future trends. Actually, in the usual case, data mining techniques provide us with satisfactory results enough for doing good business.
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