SOURCE Performs processes excluded from the scope of the system being modeled Sometimes referred to as Agents TYPE OF SOURCES Internal sources Office, department, employee within the company External sources Office, department, employee outside the company Another system Include only if the modeled system communicates directly with the programs of the other system NAMING / LOCATING SOURCES Name should be based on the title of the person or entity Register, Supplier, Marketing, IS Should be located on the perimeter of the page May be duplicated sparingly to avoid crossing lines DATA FLOWS The input of data to a process Represent the minimum essential data the dependence or coupling between processes DATA FLOW GUIDELINES Must begin at a source, must end at a sink or at a source should be given unique names name should be some identifying noun order, payment, complaint DATA STORES A repository for data that are temporarily or permanently recorded within the system An "inventory...