A method and system for generating a monotonic classifier are disclosed. A plurality of feature vectors may be mapped to a plurality of ordered classes. Each feature vector may map to a corresponding class. For each class other than the lowest-ordered class, a binary classifier may be trained to distinguish between the class and a directly preceding class in the order. The binary classifiers may be ordered based on the class corresponding to each classifier. The binary classifiers may be ordered in the form of a decision tree, which may be either balanced or unbalanced. A new feature vector pertaining to an individual may then be classified using the binary classifiers.