A Comparison of Three Systems Modeling Methodologies - High-Performance Web Databases: Design, Development, and Deployment - page 195

Exhibit 13-3. Entity-relationship model of an accounting system.
exist without being paid at a certain time. The Payment Pays many Accounts
and its participation is total. The Pay relationship has attributes because of
the M:N relationship between Payment and Account. There is a total one-to-
one relationship between Pay_Method and Payment. The Pay_Method is the
superclass for the Check, Cash, and Credit Card subclasses.
Shlaer and Mellor's Information Model
Shlaer and Mellor developed the Information Model in 1988 to help solve
problems associated with software systems development. The Information