Since the mid of 90´s, many companies had implemented Entreprise Informations Systems Management with the objective to integrate their business processes, obtaining a better control of the information generated in each of the company areas. In Petrobras, this project was initiated in the year 2000. In October, 2004, following the implementation in some units of the corporation, the system was implemented in the holding company. In parallel, it was also installed an environment (another system) to support the management processes of the company. Its purpose is to provide corporate information to help in the decision process. The objective of the present study is to evaluate the quality of the information available in the information environment. For this analysis it was choosen the area of Materials and Services. In compliance with the theoretical referential, some criteria were established as guidelines, to permit the elaboration of a questionnaire which was submitted to 130 users. The answers were consolidated and evaluated with a statistical support that produced the percentage on the levels of user´s satisfaction related to each criteria. After that, in the light of the theoretical reference, the criteria were grouped and a general evaluation of each one of the groups was proceeded. Then, for each group, possible reasons for numbers found were identified, some examples gotten in the documentary research were presented and actions of adjustment or improvement were suggested. Finally, the criterias were listed in descending order, and the major problems were found. A list of recommendations were suggested, and that will help, as an orientation for the adjustments that had to be made in Petrobras analytical environment.