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See5 supposes existence of a sample of cases where each case is described by:

number of attributes, so called predictors, doesn’t matter if they are qualitative or quantitative values, and one class which is qualitative value (several discrete values).

Problem is:

Find ‘knowledge’ describing relationship between attributes and class, something like:

IF (attribute1 is less-equal-greater-then v1 and …attributen is less-equal-greater-then vn) THEN (class is equal ci)