Explores the roots of the dilemma of behavioural consistency and reviews the solutions that have reinvigorated the field over the past two decades.

Icek Ajzen is Professor of Social Psychology at the University of Massachusetts at Amherst, USA.

Attitudes and personality traits - how they are defined and measured; behaviourial consistency - theory and research in personality and social psychology; the principle of aggregation - creating stability and consistency; moderating variables - effects of individual differences, characteristics of the disposition, situational factors, and type of behaviour; theory of planned behaviour - prediction of specific actions with varying degrees of volitional control.