STRUCTURED METHOD FOR DESIGNING SUBSYSTEMS

This paper describes a structured method for designing subsystems from a whole system, which extends ADISSA methodology for systems analysis , design and prototyping, The design of a subsystem includes: (a) defi nition of the transactions, or processes, that belong to the subsystem , thus determining the boundaries of the subsystem; (b) design of the subsystem user-interface, a sub-menu-tree, derivable from the menu-tre e interface of the global system; and (c) design of the database sub-s chema, derivable from the global database schema. The method is suppor ted by a CASE tool, enabling automatic and interactive design and prot otyping of the subsystems.