7/31/2019 Context Diagram 1

1/10

CONTEXT DIAGRAM-An overview of anorganizational system that shows the system boundary,

external entities that interact with the system,& themajor information flows between the entities & the

system.

DATA FLOW DIAGRAMIt was proposed by De Marco(1978) and Gane and Sarson (1979)

One of the most important tools used by the system analyst

It is made up of number of symbols which represents systemcomponents

A picture of the movement of data between external entities &

the processes and data stores within the system

7/31/2019 Context Diagram 1

2/10

CONTEXT DIAGRAM AND DFD SYMBOLS

A PROCESS MEANS THAT

SOME ACTION OR GROUPOF ACTIONS TAKE PLACE

AN ENTITY IS A PERSON,GROUP, DEPARTMENT, ORANY SYSTEM THAT EITHER

RECEIVES OR ORIGINATESINFORMATION OR DATA

A DATA FLOW SHOWS THATINFORMATION IS BEING

PASSED FROM OR TO APROCESS

DATA STORE - DATA THAT AREAT REST IN THE SYSTEM;

DEPICTED USING AN OPEN-

ENDED RECTANGLE IN DATAFLOW DIAGRAMS

7/31/2019 Context Diagram 1

3/10

CONTEXT DIAGRAM

0

SYSTEM

NAME

ENTITY

1

ENTITY

3

ENTITY

2

INPUT A

INPUT B

INPUT C

7/31/2019 Context Diagram 1

4/10

CONTEXT DIAGRAM

ENTITY

2

ENTITY

1

ENTITY3

1

GENERAL

PROCES

AAA

2

GENERAL

PROCES

BBB

3

GENERAL

PROCES

CCC

4

GENERAL

PROCES

DDD

D1 DATA STORE D2 DATA STORE

RECORD A RECORD E

INPUT ADATAFLOWB

DATAFLOW C

OUTPUT C

RECORD A RECORD E

INPUT B DATAFLOW D

7/31/2019 Context Diagram 1

5/10

CONTEXT DIAGRAM

Spendingrequest

Rejectedrequest

Deliveryadvice

Budgetallocation

Requ

est

for specialapproval

Responseto specialapproval

Spendingsummaries

Part order

BUDGETMONITORING

SYSTEM

DEPARTMENTS

SUPPLIERS

MANAGEMENT

MANAGEMENT

Supplierdeliveryadvice

7/31/2019 Context Diagram 1

6/10

TOP-LEVEL DFD2

Set upbudget

DEPARTMENTSMANAGEMENT

SUPPLIERS

1

Checkfunding

3

Classifyexpenditure

5

Organizesupplies

4

Providespending

summaries

Budget allocation

Spending

summariesSpending

request

ALLOCATEDBUDGET

Rejected

request

SUSPENDEDREQUEST

Recorded

request

Approved

request

Delivery advice

Request for

special approval

Response tospecial approval

DEPARTMENTALACCOUNT

TYPEACCOUNTS

Part order

Supplier

delivery

advice

7/31/2019 Context Diagram 1

7/10

Expansion of classify expenditure process

TYPE ACCOUNTS

Approved

request

Classified request

Update request

Request total

Recorded request

3.1

Classifyexpense by type 3.2

Update typeaccount

3.3

Sum total

3.4

Updatedepartmental

record

Classified requestClassified requestClassified request

DEPARTMENTALACCOUNTS

7/31/2019 Context Diagram 1

8/10

CONTEXT DIAGRAMSUPPLIERS

ENGINEERING

PRODUCTION

SCHEDULERS

0

PURCHASING

FULFILLMENT

SYSTEM Supplier MaterialSpecifications

Shipment

Requestfor Quotes

Order

Price &

TermsQuotes

Supplier MaterialEvaluation

MaterialSpecifications

MaterialAvailability

Production

Capacities

ProductionSchedules

7/31/2019 Context Diagram 1

9/10

Data Flow DiagramSUPPLIERS

PRODUCTION

SCHEDULERS

ENGINEERING

SUPPLIERS

ForecastMaterialNeeds

1.0

PlanPurchaseAgreement

2.0

DevelopPurchased

GoodS ecs

3.0

SelectPreferredSupplier

4.0

OrderMaterials

6.0

Produce

Bill ofMaterials

5.0

MaterialForecast

SupplierMaterial

Evaluation

Material

Specifications

Criteria

ProductDesign

Bill ofMaterialsOrder

PreferredSupplier

Supplier

Description

Price &Term

Quotes

ProductionSchedules

ProductionCapacities

7/31/2019 Context Diagram 1

10/10

Purchasing Fulfillment SystemAnalysis Phase Project Review

A. Summary of Project Objectives

B. Progress to Date

1. Steps Performed

2. Project Schedule

C. Findings

1. Problems & Opportunities Identified2. Information Requirements

D. Alternatives

1. Comparison of Alternatives

2. Details on Recommended Alternatives3. Justification for Recommendation

4. Resource Requirements

E. Plan for Design Phase

Questions

Conclusions & Action Items