20 Courses One set is needed for each student. Deaf Leaders can teach the Silent Word Ministries Bible Institute (DBI) in their own deaf ministries. This could be done during Sunday School time or at another time. The institute consists of 20 courses. Each student would need a copy of each course. Certificates are given at the end of each series and a beautiful diploma is given when the entire institute is finished. It has been said, “It is almost like Bible College.” Over 850 Deaf students are presently enrolled.