Abstract: Predictive modelling is one of data mining modelling to predict a value based on a pattern which has been formed by other values. Knowledge or pattern which has formed is gained from data training tabulation. Classification is one of some predictive modelling that applied this concept. There is a large number of methods that is applied on classification technique such as Naive Bayes and decision tree. Both of these methods have the same concept, however, they have different calculation stage. Even though both of these methods in conception are predicting a new value based on existing pattern, however, after being tested by random testing data from the same data training, gained different pattern.