 The basis of biodata's predictive abilities is the axiom that past behaviour is the best predictor of future behaviour.Biographical information is not expected to predict all future behaviours but it is useful in personal selection in that it can give an indication of probable future behaviours based on an individual's prior learning history.Biodata instruments (also called Biographical Information Blanks) have an advantage over personality and interest inventories in that they can capture directly the past behaviour of a person, probably the best predictor of his or her future actions.