And many of you used a combination of these. This seems to be what many of you would like to use although I heard no actual reports. This covers notices, asking people to be quiet and eventually asking them to leave. Although some people acknowledge that this is their job, others dislike it and resent being asked to discipline other people's students. The challenge seems to be to re-instil a culture of quiet, and some attempts are having results.
Silence seems easier to enforce or police is it is unambiguous.
One is the introduction of a Code of conduct emphasising the right of users to an environment conducive to study. Another institution uses the Library Charter which stresses the rights of people to a quiet study place. The only approach that I have found to work is the tough option of direct challenge. You have to tackle the noisiest groups and ask them politely but firmly to stop talking, maintaining eye contact and talking slowly and seriously. Give a reason, which is that other users wish to study quietly and are being disturbed.