COMP 3513 - Chapter 6 DFD - Workshop
1. Using the example of an online cell phone apps store, list relevant data
flows, data stores, processes, and sources/sinks. Draw a context diagram
and a level-0 diagram that represent the app store. Explain why you c
6-1. What is a data-flow diagram? Why do systems analysts use data-flow
A data-flow diagram is a graphic that illustrates the movement of data between external
entities and the processes and data stores within
6-5. How can data-flow diagrams be used as analysis tools?
Data flow diagrams can also be used for a process called gap analysis. In gap analysis,
the analyst a role is to discover discrepancies between two or more sets
Chapter 1: Introduction
get feel and
more depth, detail
later in course
use Internet as
whats the Internet?
whats a protocol?
network edge; hosts, access