Box structured information systems

摘要: The box structure methodology for information systems development is based on a usage hierarchy of data abstractions, in which each abstraction defined three distinct forms, called its black box, state machine, and clear box. Each these structures defines identical external behavior, but with increasing internal visibility, to provide hierarchical supports the principles referential transparency, transaction closure, migration, common services. This provides, turn, basis orderly management by finite set analysis design tasks spiral process. use are described.