The purpose of this study is to have a better understanding of the process of construction of the psychological contract with the individuals that has ocurred recently. This study has focused on a phenomenon that is very usual in this decade, characterized by an increase in the number of individuals that are looking to build a career in the public sector. This phenomenon has reverted a trend that had ocurred in the previous decades, that is, a decrease in the number of new employees as well as a devaluation in the image of the employees who work in the public sector. The proposal of using the psychological contract theory was motivated by the idea that this model would be capable of identifying the main factors (hidden or not) that influence the relationship between individuals and organisations, even in the process of contract building or in the contract breach. In order to test these factors, an exploratory methodology was developed, through various interviews with a group of the most recent trainees of the Administration Course of a company that belongs to the public sector (energy industry). These interviews were based on previous questionnaries. All interviews were recorded, and latter written out, aiming at identifying the main aspects that stimulated the decisions of those individuals to work in the public sector. The main results of this study confirm that individuals are looking for stability in their jobs. Additionally, the perception in relation to the public sector is positive, regarding that individuals recognize that is possible to have a career development as well as quality of life. Finally, the study purpose a framework that enables the analysis of the process of the psychological contract building between individuals and firms.