The present study, developed by a qualitative and longitudinal approach, had the goal to investigate the processes related to the conservation and the changings on the purposes of the young participants in a high school Value Education program. The relevance of such subject is associated to the importance of the understanding on how the pedagogic interferences can contribute to allow the young people to build up their projects of life driven by a ethic sense, as well as on how those projects are built along the time. For this investigation we started from the concept of "purpose", understood as a project of life that is significant for the young people, but that has implications to the world beyond them, besides the conceptions about their psychological functioning that allowed to understand how the processes of conservation and changings on the projects of life are operated. We also sought in the Theory of Models Organizers of the Thinking the theoretical-methodological contribution that allowed us to contemplate the idea of inseparability of cognition and affectivity and to analyze the empirical data with no disregarding the complexity that emerges from both dimensions. The research was performed considering 103 high school students from two schools in the southern region of Sao Paulo city. The youth from school A participated in a program, implemented by the author of this study, about Value Education that happened along 3 years of the High School graduation, while the youth from school B did not participate, being identified as a control group. The data were collected by a survey based on a questionnaire with 20 questions concerning to purpose. The questionnaire was applied in the beginning of each one of the 3 school years, plus 1 additionally at the end of the last year of the high school period, resulting in four phases of data collecting. The process of data analysis was divided into two stages: in the first one, we sought to understand the project of life presented by each one of the participants in each phase of the research. In a second we sought, by means of an individual analysis of the participants, understand the psychological dynamism that resulted in both, conservation and changing of the purpose. The results from the first stage have shown that the projects of life of the youth vary between different grades of complexities, starting on what we name as Normative Projections, that are characterized by the presence of normative desires such as to build up a family or to have a regular job, being these aspects emptied of personal meanings, until reaching the Projects of Life and of Society that are characterized by a planning that aim to materialize a project loaded of personal meaning that resonates in the society by means of a social commitment. In the second stage, the results have shown the changings on the projects of life are not linear to be systematized in a generalist model because there are different ways to change and to keep the projects. However, the results have suggested that the inte...