In other words, the moderators act as a filter of information to ensure quality. Now we take another look at networked resources that a library organises and presents. Following from its collection development policy and the professional expertise of its staff, a library can only offer a limited service with existing resources. The process of sifting and careful examination of networked documents involves not only selection but also censorship. Selection as quality control could easily mislead users into thinking that other resources did not exist on the network.
Careful decisions have to be made in the process of selection to avoid charges of censorship.
The speed in the flow of information is obviously greater than ever before. With these rapid changes, the library faces a huge problem - how to keep information and its pointers continually accurate. We must cooperate together with the computer technical staff to solve this problem. The library faces not only the problem of information explosion, but the problem of information loss as well. As for the policy and principle of collection development, we must not only consider how to manage the information explosion, but also the loss.