7/29/2019 Requirements Engineering - Software Design Diagrams

1/3

Iknowthatthen

otationforEntityTypesinvolves

ablacktriangleonthebottomrightoftheentity

type,howeverI

wasunabletodothiswiththe

softwareIused.

Pleaseexcuseme.

Note:Someofthediagramsoverthenext

pages,areacco

mpaniedbyasetofnotes

containingassumptionsandexplanations.

SSN

F_name

L_name

Salary

SUPPLIER

S_no

Parts

Location

POST_

OFFICE

Office_no

Manages

Holds

1,1

1,1

1,N

Supplies_stationary

1,5

Employs

STATIONARY

S

tationary_no

N

ame

Q

ty

0,N

5,1

Stocked_

by

Managed_

by

1,1

Works_

for

LETTER

L_no

Sender_name

Date_of_postage

Recipient_name

Recepient_address

Employee_name

DeliveryTime

ExpressLetter

Re

gistration_no

Ins

uranceValue

RegisteredLetter

CASUAL

CUSTOMER

Registration_no

Credit_rating

REGULAR_

CUSTOMER

N

ame

A

ddress

CUSTOMER

Account

Customer_nam

e

Item_posted_desc

Amount_charged

Credit_

limit

CREDIT_

LIMITED

B

alance

CREDIT_

UNLIMITED

Sorted_

by

Delivered_

to

Recieves

Sorts

1,N

N,1

N,1

1,N

1,1

1,1

Held_

by

EMPLOYEE

MANA

GER

Manager_I

D

Start_

Date

Salary

Stocks

orders

Sends

Sent_b

y

1,N

N,1

Handles

Handled_

by

VAN

1,N

N,1

delivers

1,N

Question1/PostOffice

System

:DataModel

7/29/2019 Requirements Engineering - Software Design Diagrams

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TIME

Effective

Time

Transaction

Time

Decision

TimeAbsolute

Time

Relative

Time

Chronon Interval

Start Time

End Time

Range

Value

Periodic

Time

Fixed

PeriodicTime

Unit

FACT_TYPE

Time Element

RULE

Related_toRelated_to

1,N

1,N1,N

1,N

1,1

1,1

1,N

1,1

1,1

1,1

1,1

1,N

1,N

1,1

1,N

1,N

1,1

1,N

N,11,1

1,N

1,N

1,NN,1

1,1 0,1

0,1

0,N

0,N

0,1

0,N

1,1 1,1

Consists_of

Makes_up

Consists_of

Consists_of

Is_part_of

Is_part_of

1,N

Has_a

Consists_of

Has_a

Related_to

Make_up

Consists_of

Related_to

Has_a

Makes_up

is

Can_be

Can_be

Can_be

Consists_of Consists_of

Can_beCan_beCan_be

Is_part_of

Is_part_of

Could_be

Could_be

Could_consist_of

Can_be

Can_be

Could_beCould_beQ

uestion2b

/Ametamodel

oftime

7/29/2019 Requirements Engineering - Software Design Diagrams

3/3

IknowthatthenotationforEntityTypes

involvesablacktriangleonthebottomright

oftheentitytype,ho

weverIwasunableto

dothiswiththesoftw

areIused.Please

excuseme.

T=TimeIrepresen

tedTIMEasDr.Ilias

didinthelectures

ASSUMPTIONS

Employeespartakeinrecreationalactivity,

sinceaMANAGERisatypeofemployee,

byimplication,aMA

NAGERcanalso

partakeinrecreation

alactivities.

SalaryE

MPLOYEE

Supervised_by

Partakes_

in

T T2

Works_

for

1,N

1,1

1,1

1,N

has

1,N

employs

PERSON

Name

Street

City

Post_code

Contact_number

Date_of_birth

Credit_rating

CUSTOMER

MANAGER

Furniture_

fund

Manager_id

Start_

date

DE

PARTMENT

D_nu

mber

D_na

me

D_location

COMPANY

Name

Reg_no

FURNITURE

SECRATARY

RECREA

TION

0

Orders

Ordered_

by

Hires

Supervises

T

T

T

1,1

1,1

1,1

1,N

1,1

Hired_

by

1,N

Question

2c/DataModel:

descriptio

naboutaguy

calledJohn