In 1988 we initiated our work on belief data. The work proceeded in two phases: in the first phase we formalized the concept of error in everyday record keeping, and in the second phase we considered multilevel security. The purpose of this report is to create an awareness about our works on belief data and to serve as a guide for the following manuscripts. The first two manuscripts are on the concept of errors, and the latter three are on multilevel security. Except [TR97-17], all manuscripts are in their original form
