LHCb distributed data analysis

This paper describes the LHCb distributed data analysis system. For data analysis, the LHCb Collaboration will exploit the WLCG distributed computing resources spread all over the world. Two main software tools will be used: DIRAC and GANGA. DIRAC is mainly used to easily access distributed computing resources, while GANGA is a user interface that allows users to submit analysis jobs in a data-driven mode