In case of a data security compromise, a record of who is performing what activities will help resolve some of the security issues.
Typically web servers log every page (or URL) being accessed, including the IP address of the user, date and time of access, etc. These logs are very useful in tracking the source of any security violations that may occur.
CollabNet TeamForge auditing tools are a powerful way to track unwanted and/or unauthorized changes within the system.