value appear in the same row of the grid 1206 as shown in fig1 there are three classes and correspondingly three rows in the grid 1206 the number of columns in the grid 1206 is equal to the number of attributes a k other than the class attribute all the rules for a given non class attribute a k appear in the same column i e a k th column each grid square in each column includes a histogram and each bar of the included histogram represents one rule in the k th column each bar represents the count of a two condition rule that involves the k th attribute a k as well as the class attribute c e g a two condition rule a k a kj c c i thus for example the bars in the histogram in numbered grid square 1208 represent counts for all two condition rules in which one condition is that the class attribute is equal to u201c classb u201d and the other condition is a condition on an attribute u201c attributed u201d successive bars in the histogram in numbered grid square 1208 correspond to successive values of u201c attributed u201d for quantitative attributes successive bars represent counts for bins created by discretization within each grid square the user is able to see a family of rules which are.