ABSTRACT
Interest of the study:
The interest of this research focuses mainly on three aspects: First, it aims to help clarify empirically the importance of a number of personal and organizational variables may have a significant impact on people´s knowledge sharing behaviors. Secondly, it goes beyond previous research on this line, by focusing on working groups. Personal and organizational variables are assessed at different levels (individual, group and organizational).
Finally, based on the results of our study, we try to suggest and identify managerial interventions than can foster knowledge sharing within an organization and result in better outcomes for it.
Objectives:
The main goal of this research is to investigate individual, group and organizational factors that influence knowledge sharing behaviors. The relevance of these knowledge sharing behaviors, which are necessary for group learning, justifies the importance of this study. In particular, the individual variables investigated are the self-efficacy and personal expectations of results, the group variable is team climate and the organizational variable is organizational support. Finally, it has also studied the role of organizational justice and justice climate in predicting knowledge sharing behaviors.
Elements of the methodology include:
In addition to descriptive analysis and bivariate correlations, we used analysis to test complex models. In particular we have used the Confirmatory Factor Analysis (CFA) (Lévy Magin & Varela Mallou, 2006) and Structural Analysis Models (SEM) (Anderson & Gerbing, 1988; Bollen, 1995; Hair et al., 2008; Ruiz et al., 2009).
The confirmatory factor analysis has allowed us to validate the scales and the structural models confirm the relationship of the models. 
Finally, and particularly relevant given the paucity of similar studies in this area, to study the relationships between variables at different levels have used a cross level approach to hierarchical multiple linear regressions (Pardo et al., 2007; Raudenbush & Bryk, 2002).
Results:
Our study shows how the participation in knowledge sharing are significantly related to individual, group and organizational variables. Organizational commitment also predicted knowledge sharing behavior. Finally, organizational justice has been shown to have a fundamental role in knowledge sharing behaviors, both individual and group level.