The LNLS 25th Annual Users’ Meeting (RAU) will take place from September 16th to 17th, 2015, in Campinas, Brazil. RAU has the objective of encouraging debates, the exchange of experiences and the integration of the LNLS user community. It is an important forum for discussion, evaluation and presentation of proposals for the improvement of the research structures and of the scientific instrumentation available at the synchrotron light source. The meeting represents also an opportunity for the exchange of information about the research carried out at the facilities.