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ACG 4401. Data Model Examples: DFD’s and System Flowcharts. 0. Employee Tax Form. Employee Payroll System. Payroll Report. Time Sheet. Employee Payroll Check. Context-Level Diagram. Employee. Accounting Department. 21. Employee Data File. Payroll Data File. 2.0.

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Acg 4401

ACG 4401

Data Model Examples:

DFD’s and System Flowcharts


Context level diagram

0

Employee Tax Form

Employee

Payroll

System

Payroll Report

Time Sheet

Employee Payroll Check

Context-Level Diagram

Employee

Accounting Department

21


Level 0 dfd

Employee

Data File

Payroll

Data File

2.0

Employee Record

Paycheck Data

Employee

Compute

Weekly

Paycheck

S1

S2

Payroll Record

Hours Worked

3.0

1.0

Employee Payroll Record

Prepare

Weekly

Payroll

Summary

Create

Weekly

Payroll

Record

Time Sheet

Employee Paycheck

Payroll Report

4.0

Prepare

Employee

Tax

Form

Employee Tax Form

Accounting

Department

Level-0 DFD

22


Level 1 dfd

1.0

4.1

2.1

4.2

2.2

3.1

2.3

3.2

Employee Data File

Payroll Data File

S1

S2

Employee Record

Compute

Gross

Pay

Create

Payroll

Check

Print

Weekly

Payroll

Summary

Compute

Net

Pay

Print

Employee

Tax

Form

Calculate

Payroll

Deductions

Sort

Payroll

Records by

Employee

Create

Weekly

Payroll

Record

Payroll Record

Hours Worked

Gross Pay

Data

Net Pay

Data

Time Sheet

Sorted Records

Employee Paycheck

Payroll Report

Employee Payroll

Record

Payroll

Deductions

Employee Tax Form

Level-1 DFD

Employee

Accounting Department

23


Functional primitive

4.1.1

4.1.2

4.1.3

4.1.4

4.2

Employee

Payroll

Record

Print

Employee

Tax Form

Calculate

Payroll

Tax

Deductions

Calculate

Employee

Vacation

Pay

Calculate

Retirement

Allowance

Calculate

Non-tax

Deductions

Employee Tax Form

Employee Data

Employee

Data

Employee

Data

Employee

Data

Functional Primitive

24


Acg 4401

The data-entry clerk keys in an input document into the computer. The computer accesses data in a data store 1 and in data store 2 to edit/validate the input. The computer displays the input, including any errors. The clerk compares the input document to the display, keys corrections as necessary, and accepts the input. The computer updates the table in data store 2 and notifies the clerk that the input has been recorded.

44


Acg 4401

User queries the computer. The computer accesses the table(s) in one of more data stores & presents a response to the user.

Update sequentialdata store from magnetic disk are input to the computer, along with the existing (old) master data – becoming the new master data

45


Acg 4401

The user batches the input documents, prepares batch totals, and keys the documents into the computer. The computer records the inputs on disk and notifies the user as each input is accepted. The user files the input documents in numerical sequence. At the end of the batch, the computer prepares an exception & summary report that includes batch totals. The user compares the computer batch totals to those prepared earlier.

46


Acg 4401

A data entry clerk enters documents into a networked PC system. The system records the inputs on a disk and notifies the user of the acceptance of each input. The documents are then forwarded to a different clerk who keys the documents again. Differences are resolved and the event data are updated to reflect the verifications and corrections.

47


Acg 4401

A clerk scans a document into the computer. Use the data from the scanned document, the computer updates the data store(s)

48


Acg 4401

A clerk scans a document into the computer. The computer routes an image of the scanned input to a data entry clerk, who keys data from the documents image into the computer. The computer records the data with the scanned document

49