A method and system for collecting and reviewing data related to web services receives service criteria from a service requester, selects candidate services that match the service criteria, invokes the selected candidate services, and aggregates results provided by the candidate services. In conjunction with aggregating results, the method and system builds service result objects conforming to a composite schema constructed from the various result schemas. To increase the utility of the aggregated results, metadata such as an invocation timestamp are also attached to each service result object. Result values are inspected and enumerated within a results table that may be used to determine which service result objects contain a particular result value.