You have been asked to build one of the following systems.

a) A network-based course registration system for your university.
b) A web-based order-processing system for a computer store.
c) A simple invoicing system for a small business.
d) Software that replaces a Rolodex and is built into a wireless phone.
e) An automated cookbook that is built into an electric range or microwave.
f) An application with which you are familiar.

Select the system that is of interest to you and describe data objects, relationships, and attributes.
Note: The system selected will be used in the following project activities.

Draw a context-level model (level 0 DFD).
Write a context-level processing narrative for the system.

Using the previous context-level DFD, develop level 1 and level 2 data flow diagrams. Use a “grammatical parse” on the context-level processing narrative to get yourself started.
Remember to specify all information flow by labeling all arrows between bubbles. Use meaningful names for each transformation.
Develop CSPECs and PSPECs for the system.

Try to make your model as complete as possible.