The communication of health data for the realization of a study among public administrations has to undergo the regime established in the LOPD (article 11.2.f) and to the legislation about health governmental or autonomic. The communication of these data requires a previous procedure from anonimització (article 11.3 of the Law 21/2000, of 29 December). The Service of Occupational Risk Prevention will be able to receive the data resulting from the study to adopt decisions of collective level that allow to improve the working conditions. The contribution of technical support to the assignor administration on the part of the assign administration, which means an access to the data of health, requires the contract of order of the treatment (article 12 of the LOPD).