Documents which accumulate or wait in the system may indicate the presence of a data store. ... Rather the data flow diagram should depict the essential packets of information flowing into the system. ... Look for files, manual or automated, in the existing system. b. ... For example, in a payroll system time cards may be filled out, submitted, and checked daily or weekly but not processed until the end of the anbsp;...
|Title||:||Structured Analysis Methods for Computer Information Systems|
|Author||:||Lavette C. Teague, Christopher W. Pidgeon|