Essay
Figure TB-4.5 shows a level 0 logical data flow diagram for a billing system.The logical data flow diagram intentionally violates several of the guidelines and other techniques presented in the text for drawing data flow diagram.Required:
Identify as many of the errors in the logical data flow diagram construction as you can.In the logical data flow diagram, place consecutive numbers (each in a circle) next to the points at which the errors exist.On your solution sheet, list the numbers and write a one- to two-sentence description of each error and what the correct procedure should be.If an error occurs in more than one place, mark each occurrence of the error.Error 1 is provided as an example of how to construct the solution. 
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