The usual approach for these problems is to admit that you don't know what the rules are, and instead train a statistical classifier based on some sample data:

The usual approach for these problems is to admit that you don't know what the rules are, and instead train a statistical classifier based on some sample data: http://crm114.sourceforge.net/ http://crm114.sourceforge.net/ Depending on how hard your problem is, the accuracy of the classifier may not be very good. You can try to come up with fancier "features" to extract from the items and feed to the classifier, or you can use "artificial artifical intelligence" and just farm out the work to Mechanical Turk at a penny per review.