ResumenEl artículo presenta y defiende un enfoque biográfico acerca de la sociología de la juventud, y define la juventud como proceso social de emancipación que atañe a aspectos económi-cos (posición social y enclasamiento) y familiares (emancipación de la familia). En la base del enfoque biográfico está el análisis acerca de los itinerarios y en la base sociológica está el estudio de la diversidad de tipos de itinerarios y sus efectos. Las «modalidades de transición» son la aportación principal del artículo, juntamente con la consideración triangulizada de las edades, las promociones y los períodos. Este planteamiento teórico tiene efectos directos acerca de la propuesta metodológica de corte biográfico y longitudinal defendida en el artículo como vía fecunda para el desarrollo de la sociología de la juventud. La aportación del artículo proviene de una investigación sociológica a partir de una encuesta a los jóvenes de Catalunya, pero tiene sus raíces en otras investigaciones del GRET acerca de la sociología de la juventud y de los procesos de emancipación profesional y familiar. Palabras clave: juventud, generación, edades, itinerarios, transición, emancipación familiar, políticas de juventud. Abstract. Theoretical and methodological contributions to Sociology of Youth from transition approachThe paper presents and defends the biographical approach in Sociology of Youth. Therefore, youth is defined as a social process of emancipation that involves economical issues (social position and classification in social structure), family issues (family emancipation). The biographical approach is grounded in the analysis of pathways, and the sociological background is focused on the analysis of different forms of pathways and their effects. These «forms of transition» are the main contribution of this paper, with the combination between ages, cohorts and periods. This theoretical approach has a direct translation to the methodological proposal we do: the longitudinal and biographical approach defended in the paper has a productive development of Sociology of Youth. The contribution of the paper comes

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Recommender systems aim at filtering large amounts of information for users, providing them with those pieces of information which better meet their preferences or needs. Such systems have been traditionally used in diverse areas, such as e‐commerce or tourism. Within this context, group recommender systems address the problem of generating recommendations for groups of users who might have different interests. Although different aggregation processes have been extensively utilized in real‐life applications to generate group recommendations, such processes do not guarantee that the list of products recommended to the group reflect a high agreement level among its members' individual preferences. Given the need for considering the added value of obtaining group recommendations under a high agreement level, this paper presents a novel group recommender system methodology that attempts to reach a high level of consensus among individual recommendations of group members. To do this, and inspired by existing group decision‐making approaches in the literature, a consensus reaching process is carried out to bring such individual recommendations closer to each other before delivering the group recommendations.

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The study of tax behaviour is a research field which attracts increasing interest in social and behavioural sciences. Rational choice models have been traditionally used to account for that behaviour, but they face the puzzle of explaining levels of observed tax compliance which are much higher than expected. Several social influence mechanisms have been proposed in order to tackle this problem. In this article we discuss the interdisciplinary literature on this topic, and we claim that agent-based models are a promising tool in order to test theories and hypothesis in this field. To illustrate that claim, we present SIMULFIS, an agent-based model for the simulation of tax compliance that allows to combine rational choice with social influence mechanisms in order to generate aggregated patterns of tax behaviour. We present and discuss the results of a simple virtual experiment in order to show the potentialities of the model.