services and applications running on devices placed in live wireless environments are tested and reported to determine the relative performance of the device under test . multiple logs collected from the device under test are combined and transmitted to a remote backend system . the backend system stores and analyzes the combined logs to generate reports containing factual and relative performance information regarding the device during the testing period . the nature of the test , the collected log information , and the report format may all be modified according to the criteria of the requestor .