A survey of the information systems for the control, measurement and mitigation of operational risk (OR) was carried out, with a representative sample of banks of the argentine financial system. The survey was structured in three sections: i. organizacional structure and resources for the management of OR; ii. data monitoring and back up and; iii. other aspects. With the results of the survey, four groups of financial institutions were distinguished with regard to OR information systems: i. those that have assigned the function to a specific sector and have advanced in the registration of OR events and in the measurement of their impact, with the object estimating and mitigating the OR; ii. those in which the function is in charge of other areas related to the management of risks and/or audit, but that register important developments in their OR information systems; iii. those with a specific management unit responsible for the function, but that are in a preliminary stage as far as the measurement of OR and; iv. organizations that lack an area responsible for the administration and measurement of OR, but nevertheless register OR event data. A conclusion of the paper is that while most local banks are still in an initial stage regarding information systems for OR and in general lack an integral approach to OR management, their registries usualy contain data regarding OR events useful to perform estimations. The financial institutions also consider the measurement and control of OR as an important factor, since they consider that its consequences have huge cost although they can be mitigated.