A context diagram and level 0 data flow diagram (DFD) are created to represent the information system at a typical library. The context diagram includes external entities connected to the library with labeled data flows and no errors. The level 0 DFD lists the main subsystems without data stores and has correctly labeled data flows without errors.

1. Draw a context diagram and a diagram 0 DFD that represents the information system at a typical
library. First create a Functional Decomposition Diagram (FDD) to identify the major functions
before you start your DFD. Using your personal experience and your understanding of library
functions, create a basic context diagram.
Criteria:
Context diagram is created correctly with reasonable external entities. Data flows are all labeled.
No errors on this diagram.
Level 0 diagram has main subsystems listed. No Data stores are present. Data flows are labeled
correctly. No errors.
Level 1 diagram is complete with data stores correctly connected. Data flows are labeled. No
errors.
Decomposition of Level 1 diagrams are appropriate and correct. Data flows are labeled. Data
stores exist. No errors.
Data stores are present in the correct places with meaningful names.