By: A.J.M. Imtiajur Rahman

1

Data Flow Diagram (Level-0 to Level-1)

Scenario

Consider a Garment system where foreign buyer gives some order to the garment. The garment management receives the order and distributes the work to its employees. After the completing the task employees send the task to the QC department to check. QC checks the work quality and send it back to employee for correction if there is any defect found. Employee resolve the defects and re-send the corrected work to the QC again. QC checks the corrected work and submit the final report to the management (if the work pass the QC test). Management then deliver the shipment the buyer (along with the QC report). All user need to log in the system to use it.

Now prepare a complete Logical design for the system.

3

DFD Level-0 (Context Diagram)

Garment Management Process

DFD Level-0Foreign Buyer

Employee QC

Garment Management

Buyer Registration Information

Buyer Registration Confirmation

Give Order

Receive defects form QC (if any)

Employee Registration Information

Employee Registration Confirmation

Submit finished task to QC

Submit corrected work to QC (if required)

Receive Shipment

Management Registration Information

Management Registration Confirmation

Receive Order

Deliver Shipment

Submit defects (if any)

QC Registration Information

QC Registration Confirmation

Receive finished task to check

Submit Final QC Report

Receive the corrected task (if required)

Figure-1: Context Diagram of Garments Management System

Receive final QC clearance

By: A.J.M. Imtiajur Rahman

Receive Distributed task

Distribute task to the employee

4

How process can be broken down to next level

Rules:• Focus on the major incidents of the scenario• Stakeholders relevance with the incidents • Every sub-process along with its dataflow can create independent system.

Example:

Garment Management Process

DFD Level-0 User Registration Process

Order Dealing Process

Quality Checking Process

DFD 1.1

DFD 1.2

DFD 1.3

Lev

el-1

DFD

Figure-1: Process breakdown from upper level to lower level

By: A.J.M. Imtiajur Rahman

5

DFD Level-1

DFD Level-1

Foreign Buyer

Employee

QC

Garment Management

Buyer Registration Information

Buyer Registration Confirmation

Give Order

Receive defects form QC (if any)

Submit finished task to QC

Submit corrected QC work (if required)

Receive Shipment

Management Registration Information

Management Registration Confirmation

Del

iver

Shi

pmen

t

Submit defects (if any)

QC Registration Information

QC Registration Confirmation

Receive finished task to check

Submit Final QC Report

Receive the corrected task (if required)

Figure-1: DFD Level-1 of Garments Management System

User Registration Process

Order Dealing Process

Quality Checking Process

DFD 1.1

DFD 1.2

DFD 1.3

User List

Prod. List

Rec

eive

Ord

er

Emp. Registration Information

Emp. Registration Confirmation

By: A.J.M. Imtiajur Rahman

Receive Final QC Report

Management distribute task

Emp. Receive distributed task

By: A.J.M. Imtiajur Rahman

6

And That’s How DFD Works!