What is the difference between model, mini-model, and site recruitment and participant study materials?

Model and Mini Model Materials: A study sponsor may submit model participant recruitment and participant study materials on behalf of all or some of the investigators participating in a protocol. These materials may be approved without investigator-specific contact information, which can be added by the investigator after approval. Generally, model participant recruitment and participant study materials are reviewed by the Board and approved for use by all investigators in a study. However, a sponsor can identify a subset of investigators to use particular participant recruitment and/or participant study materials which will be approved as mini-model materials.