Disclosed are new approaches for monitoring an information system such as a GIS. For each service of a plurality of services provided by service computers, a periodic evaluation is performed by requesting performance of the selected test service routine by the service. If no valid response to the request is received within a response window the monitoring computer may produce an output indicating an error status for the service. The response window may be a time window or a maximum number of transmitted requests without a valid response. A monitoring computer may transmit requests to perform a service at a first period if an error indicator associated therewith is set and periodically at a second period if the error indicator associated therewith is not set. Requests to perform the service may not be transmitted during an exclusion time associated with a service or its corresponding service computer.