Abstract: A computer-implemented system and method compute a reference behavior for a user, such as a new user of a set of shared devices or services. The method includes acquiring usage data for an initial set of users of the devices and extracting features from the usage data. A model is learned with the extracted features for predicting a user role profile for a new user based on features extracted from the new user's usage data. The user role profile associates the user with at least one of a set of roles. A new user's usage data is received and, with the trained model, a user role profile is predicting for the new user based on features extracted from the new user's usage data. A reference behavior is computed for the user based on the predicted user role profile and the reference behaviors for roles in the set of roles.