Librarians have, in general, very little systematic information about activities inside their libraries.
CounT The Traffic (TTT) is a cheap and simple method to gather such data. It gives a good numerical picture of how library users actually use the various parts of the library. TTT reveals both the quality – or the kinds of activity – and the quantity of use. Combined with data on the number of visitors it will also indicate the average length of stay.
For more information see the TTT home page.
Initially, Count the traffic was shortened to CTT. This was changed to TTT so as to have the same expression in English as in Norwegian.