An analysis of the factors of conversion from a batch-processing, tape-oriented retrieval system to an on-line, real-time system

The factors for converting a batch-processing, tape-oriented document reference system to an-on-line, real-time system are discussed. The factors analyzed are file structures, file addressing, file maintenance, communication, scheduling, and modular programming structures. The levels of design for the individual factors are illustrated in order to show the complexities of conversion to an on-line, real-time system. It is concluded that system conversion from a batch-processing, tape-oriented system to an on-line, real-time system requires a total systems redesign, not a modification of the existing system. A vector model for system conversion is presented. The vector quantities of the model represent the factor levels and their probable costs-for implementation. It is concluded from the analysis and the vector model that interrelations between the factor levels must be followed for an operationally complete system conversion.