Context Diagrams

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Context Diagrams IPT 2010

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Context Diagrams. IPT 2010. Context Diagrams. - PowerPoint PPT Presentation

Transcript of Context Diagrams

Page 1: Context Diagrams

Context DiagramsIPT 2010

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Context Diagrams

Context diagrams are used to represent entire information

systems. The system is shown as a single process along with the inputs and outputs (external entities) to the system. The

external entities are connected to the single process by data flow

arrows.

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Context Diagrams

A context diagram is often the starting point of a data flow

diagram. Context diagrams show the flow of data in a system.

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3 SymbolsThe Process

The Data Flow

The External Entity

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Process

Single Process: A circle is used to representthe entire system.

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Data Flow

Data Flow: An arrow is used to represent the flow of data between the process and external entities.

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External Entity

External Entity: A square or rectangle representsany person or organisation that sends data

to or receives data from the system.

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ExampleFinding a book in the library

BorrowerSearc

hBorrower

Book Details Call Number

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ExampleA context diagram for a retail sales company

company.HeadOffice

Office

SalesDept

.

Purchase

Dept.

Accounts

Warehouses

SalesDivisio

n

Division

Suppliers

Banking

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Activity

A marking system is a process used to determine the result of an

assessment task. Students complete the assessment task and receive a mark from the marking system. A teacher constructs a

marking scale for the assessment task and receives each student’s

mark. Construct a context diagram for the marking system.

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Textbook

Page 270- ‘Consider the Following”

~Read as a whole class~

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HSC Style QuestionDevelopment of a new information system is

being considered. They system is used to assess the impact of various types of security used to

protect different types of residential and commercial buildings in various locations. The

system aims to provide information to insurance companies to enable them to accurately modify the amount their customers pay for insurance

based on the insured building’s security features, location and type. The results from the system will be sold to insurance companies who can then download updated information each

month.

a) Draw a context diagram for the proposed system based on the above description

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Suggested Solution

Building owners

and tenants

SecurityAssessme

ntSystem

Assessment

InsuranceCompanies

Building Type, Location,Security Features Results

How did you go??

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Textbook Reading

Read pg. 395-396.

Group Task Discussions pg.396

Group Task Activity pg.36


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