1. A method of generating at least a portion of a decision tree structure on a computer, the decision tree structure generation being performed by the computer to classify one or more multidimensional data objects comprising data records of personal attributes stored on data storage device coupled to the computer, the method comprising the steps of: representing data associated with the one or more multidimensional data objects as a node of the decision tree structure; determining a condition for dividing the data at the node into at least two subsequent nodes based on a discriminant measure which substantially maximizes separation between classes associated with the data; and dividing the data based on the condition, wherein the resulting nodes form at least a portion of the decision tree structure.