In banking organizations, the folders storage practice raises two main questions : the performance of management of the services companies and the effectiveness of intra-organizational coordination mechanisms. The concept of convention is mobilized to address the need for coherence between the cognitives and socio-technical dimensions of the coordination and its goals. We use a grid to analyze the process of real estate loans in retail banking. The operationalization of this grid highlights the contribution of the convention theory to organizational performance and initiates a typology of conventions which permits to understand the origin of potential failures of coordination.