Identifying and reporting differences in network activity data files

A method of identifying differences between activity data files includes determining a difference between the activity data files. Causal analysis may be performed to identify a cause of the difference. The difference and/or the cause of the difference may be rendered based on a rendering template. Tier pairs between the activity data files may be matched and a user may be queried to confirm the tier pair match. Statistical and/or protocol differences between each of the activity files may be presented. Transactions between each of the activity data files may be matched including comparing the content files in each of the activity data files that account for the transactions. Client side differences between each of the activity data files may be identified. A categorization may be assigned to each of the determined differences. Determined differences may be excluded from the rendering.