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Grading Key DFD Exercises – Exercise #4

Grading Key DFD Exercises – Exercise #4. 50 pts – credit for turning in. Prob. #4.1 – Figure 0 Diagram (-5 points each, but not repeated errors, e.g. if process shape is wrong for all 3 processes, then only 5 off) Each process numbered and defined with a verb + object and correct shape

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Grading Key DFD Exercises – Exercise #4

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  1. Grading KeyDFD Exercises – Exercise #4 50 pts – credit for turning in • Prob. #4.1 – Figure 0 Diagram (-5 points each, but not repeated errors, e.g. if process shape is wrong for all 3 processes, then only 5 off) • Each process numbered and defined with a verb + object and correct shape • Each process must transform data, so -5 if “print” or “send,” etc (max of -5 ) • Three processes – Enter data, Edit data, and Update master file (OK to have 4 – e.g. such as Prepare Error Listing or Prepare Transaction Listing • Two environmental entities – Customers and New Accounts Department (or just New Accts if Customer is an actor—see option 3); must be square shape • Environmental entities not connected to each other (should have process) • Each data flow named, except the data coming out of the new account file can be unnamed; • Must have data store for Customer Master File; other is optional; must be open rectangle • Must not include hardware • 4.2 Context Diagram (-5 points each error below) • Only one process, labeled with system name OR verb + object • Process not numbered • Same environmental entities as Figure 0 diagram (can be 1 or 2 but must match the student’s own Figure 0) • Same data flows as Figure 0 to and from EE’s Ex4answer.ppt

  2. DFD Problem 4.1 (Exercise 4) option with 2 files – best interpretation New account applications 1.0 Enter application dataCustomer service rep Entered New account data 2.0 Edit new account data Info System Error listing Valid new accounts S1 New Account File Stored new account Transaction listing 3.0 Update customer master file Info System New account data Ex4answer.ppt

  3. Context Diagram -- Problem 4.2 New Account Applications This version matches the DFD with 2 EEs; a student who includes the Customer as an actor, should have only the New Acct. Dept. as an EE. Open NewCheckingAccounts Transaction Listing Error Listing Ex4answer.ppt

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