ITM 410 Lecture Notes - Lecture 3: Data Flow Diagram, System Context Diagram, Business Process

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 410
• Professor: Hesham Saadawi

Document Summary

Data flow diagrams portray business process activities, stores of data, and flows of data among those elements. System flowcharts present a comprehensive picture of management, operations, information systems, and process controls embodied in business processes. It"s a graphi(cid:272)al represe(cid:374)tatio(cid:374) of a s(cid:455)ste(cid:373) that depi(cid:272)ts the s(cid:455)ste(cid:373)s (cid:272)o(cid:373)po(cid:374)e(cid:374)ts; the data flows among the components; and the sources, destinations, and storage of data. Do not depict management or operational elements of a system. External entities are those entities (i. e. persons, places, or things) outside the system that send data to, or receive data from, the system. It"s a graphi(cid:272)al represe(cid:374)tatio(cid:374) of a s(cid:455)ste(cid:373) sho(cid:449)i(cid:374)g the s(cid:455)ste(cid:373)"s i(cid:374)ter(cid:374)al and external entities, and the flows of data into and out of these entities. Specifies where, how, and by whom a s(cid:455)ste(cid:373)"s pro(cid:272)esses are accomplished. It"s a(cid:374) e(cid:374)tit(cid:455) (cid:449)ithi(cid:374) the s(cid:455)ste(cid:373) that tra(cid:374)sfor(cid:373)s the data su(cid:272)h as a(cid:272)(cid:272)ou(cid:374)ti(cid:374)g (cid:272)lerks (persons), departments (places), and computers (things).