a logical question that should arise after studying the various structured analysis tool is, "how are the products that are derived from each of these tools integrated?" In other words, how other charts, diagrams, dictionaries, and tables tied together to derive a coherent picture of system design? These development tools a computerized to improve the efficiency, accuracy, and completeness of the system development process. These computerized systems are called computer aided software engineering (also referred to as computer aided system engineering), or CASE, tools.
CASE toolsprovide a mechanism for the electronic development of systems analysis aids such as structure charts, DFD's, ERD's, and data dictionaries. Instead of developing charts and diagrams manually, the analysts can use a computer program with a graphic interface to assist in development. CASE tools do not automatically develop the various charts and diagrams. Rather, the designer interacts with the CAFC program to select the appropriate symbols, connectors, and labels and electronically draw the proper diagram. All diagrams, graphs, tables, and dictionaries that are developed are stored electronically.
CASE toolshelp design is relate their work electronically by organizing information about a system in a central repository. The central repository may contain data models, logic definitions, and functional models and may screen and report definitions. After it is developed, designers can query the repository for information about the system.
if new processes are added - models, graphs, tables, and dictionaries can be reused or easily updated.