All of these contribution mechanisms are made more efficient by users' behavior. Far from being a collection of isolated persons, users are a true community within which numerous exchanges take place. We especially note the impressive activity on the user discussion mailing list, <email>debian-user@lists.debian.org</email> (<xref linkend="solving-problems" /> discusses this in greater detail). <ulink type="block" url="https://lists.debian.org/users.html" />