Modeling a system
uWhat are we modeling?
ØComputer things
ØReal-world things
uErwin and Oracle Designer help build systems.
ØTables, columns and foreign key constraints.
ØOnly helped to solve a small percentage of the problems.
uData models do not provide complete information about the objects they model.
Øno process flow
ØNo information about how applications interact with objects.
ØMissing information such as “Departments with employees must have at least one manager”
ØLittle UI information
uModeling grammars limit themselves to what they generate.
