In this model, two or more libraries team up to offer reference service using any of the above online formats. The user would send to a member library his or her request, which would be forwarded to the library best able to answer the question. A library may get a question routed to it because it has particular strengths in its collection that match the needs of the user. Or a member library might get a question routed to it because it happens to be open when the user makes his or her request. For example, a user in New York who tries logging on at 3 a.m. Eastern time to the chat reference service of a member library in Boston could be automatically routed to a member library in Hawaii or Australia that, because of the time zone difference, is open. Most collaborative live reference services operate on a 24/7 basis.