ITEC 1010 Lecture Notes - Lecture 50: Accounts Receivable, Flowchart, Data Flow Diagram

• School: York University
• Department: Information Technology
• Course: ITEC 1010
• Professor: Colin Coates

Document Summary

Dfds are easy to develop and easily understood by nontechnical people. Data- flow diagrams use four primary symbols, as illustrated in figure 12. 18b: data flo(cid:449). The data-flow line includes arrows that show the direction of data element movement: pro(cid:272)ess sy(cid:373)(cid:271)ol. The pro(cid:272)ess sy(cid:373)(cid:271)ol re(cid:448)eals a fu(cid:374)(cid:272)tio(cid:374) that is perfor(cid:373)ed. Computing gross pay, entering a sales order, delivering merchandise, and printing a report are examples of functions that can be represented with a process symbol: e(cid:374)tity sy(cid:373)(cid:271)ol. The e(cid:374)tity sy(cid:373)(cid:271)ol sho(cid:449)s either the sour(cid:272)e or desti(cid:374)atio(cid:374) of the data element. An entity can be, for example, a customer who initiates a sales order, an employee who receives a paycheck, or a manager who receives a financial report: data store. A data store re(cid:448)eals a storage lo(cid:272)atio(cid:374) for data. A data store is a(cid:374)y computerized or manual data storage location, including magnetic tape, disks, a filing cabinet, or a desk.