Statistics are a useful tool when evaluating how well a service is being used, to determine usage of databases, or to see how many times a Web site has been visited. Tracking the usage of QR codes is no different. Although the technology is free and only requires time and effort, it is important to know whether users are using them. As mentioned previously, the Paul G. Blazer Library uses QR codes in a variety of different ways, such as in the online catalog, in the Mobile Services booklet, on the Web site, and on the flyer for the mobile Web site. However, the library only tracks usage of individual QR codes that are in the Mobile Services booklet, on the Web site, and on the flyer for the mobile Web site. The use of QR codes in the online catalog is not tracked because it is simply not practical and they are generated differently than the other ones. The QR codes in the catalog are generated by a snippet of code based on the bibliographic identifier, whereas the QR codes outside the catalog are generated individually.