First published in 1985. The present volume is a theoretical and methodological supplement to the Nuttin's book 'Motivation, planning and action: A relational theory of behaviour dynamics?, in which he showed that behaviour dynamics in man, due to their interaction with higher cognitive functioning, are processed into gaols and means-end structures- that is behavioural projects or plans. The main purpose of the theoretical section of this book is to contribute to the integration of the future time dimension on the study of human motivation and behaviour. The moan part is then devoted to a two-step method for studying the content and density of a person's future time perspective and for measuring its depth or extension.