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ApplicantUniversity

Administration

University Course RegistrationSystem

MATSECResults

Applicant Details

Course Details

Denial Note

Acceptanc

eNote

Student Details

Course Details

Example 1: A basic DFD of a University Course Registration System

Level 0:

Level 1:

ApplicantUniversity

Administration

Validate Inputted

Details

MATSECResults

ApplicantDetails

Course Details

Denial Note

Acceptanc

eNote

Student Details

Course Details

Process Application

Course Details

Student Details

Level 2:

Validate Inputted Details

Check that the

information is all true

MATSEC Results

ApplicantDetails

Course Details

DenialNo

te

CourseDetails

Student DetailsCheck that applicant is

eligible for the course

Check that the results are

valid and not tampered

ApplicantDetails

Denial Note

Resul

tGrades

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Validate Inputted Details

Check that the

information is all true

MATSECResults

Applicant

Details

Course Details

DenialNo

te

CourseDetails

Check that applicant is

eligible for the course

Check that the results are

valid and not tampered

ApplicantDetails

Denial Note

ResultG

rades

Process Application

Store Students in DBStudent Details

Students DB

Store in courses DB Courses DB

StudentDetails

Inform faculty officeStudentDetails S

tudentDetails

Cours

eDeta

ils

Coursean

dstudent

Details

CourseDetails

Accep

tance

Note

ApplicantUniversity

Administration

University Course Registration System

Example 1: Super Imposed

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Example 2: (Taken from CSA1011 past paper [February 2005])

Draw up a DFD of a very simple Maltese car number plateregistration system storing registered number plates on a

database. Your system should offer the following functionality:

Register (add) a numberRetire (delete) a previously registered number

Check number for validity

Check numbers for uniqueness against a database of

assigned numbers

Confirm valid registration

You should decompose your DFDs to whatever level you deem

necessary to produce PSPECs in any form of pseudo code you

wish. All PSPECs must be shown.

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Example 2: A basic DFD of a Maltese car number plate registration system

Car Owner Transport AuthorityCar Registration System

Newcarnumber

Old car number

Registration details

Registration confirmation

Registrati

onDenial

Deletion notification

Registration notification

Level 0:

Level 1:

Register car

Delete car

Car Owner Transport Authority

Newcarnumber

Registration details

Oldcarnumber

Registration confirmation

Deletionconfirmation

Delet

ionnotific

ation

Registrationnotification

Level 2:

Update car

database

Car DB

Generate registration,

confirmation and

notificationCar

details

Cardetails

Newcarnumber

Registration details

Registrationnotification

Register Car

Carnumber

Oldcarnumber

Delete Car

Registrati

onconfirm

ation

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Update Car Database

Create new record in car database

Store car number and registration details in new record

Perform database update

Generate registration confirmation and notification

Display registration confirmation on users screen

Print registration confirmation

Sand registration notification to Transport Authority

Compare car number with databaseSearch for old car number in car database

IF found

THEN get record number

Delete Record

Locate record with record number in car database

Get car recordDelete record from car database

Generate deletion confirmation and notification

Display deletion confirmation on users screen

Print deletion confirmation

Sand deletion notification to Transport Authority

PSPECS for processes at level 2

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Update car

database

Car DB

Generate registration,

confirmation and

notificationCar

details

Cardetails

New car number

Registration details

Registration notification

Registration confirmation

Register Car

Compare car number

with database

Car DB

Carnumber

Oldcarnumber

Delete Car record

Acknowledgement (With Record number)

Recordnu

mber

Rec

ordnu

mbe

r

Car

Rec

ord

Generate deletion,

confirmation and

notification

Recordnumber

CarRecord

Deletion notification

Deletion confirmation

Delete Car

Car Owner

Transport Authority

Car Registration System

Example 2: Super Imposed