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SYSTEM ANALYSIS AND DESIGNInformation System for a Car Re-sale Center

TRUEVALUE

Submitted to:

Prof. Malathi Sriram

Date: 21.02.2011

SubmittedBy:Group: 9

Amit Kumar Jha 10064

Ashish Arora 10071

K Swetha Nandana 10081

Monalisa Mazumdar 10088

Ragunandan V R 10095


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Table of Contents

1. Acknowledgement ................................................................................................. 3

2. Executive Summary .............................................................................................. 4

3. Overall Business Process ...................................................................................... 5

Existing System DFD ........................................................................................................... 6

4. New Information System ...................................................................................... 7

Context Analysis Diagram .................................................................................................. 7

5. Data Flow Diagrams (DFDs) ............................................................................... 8

Purchase Process.................................................................................................................. 8

Checking and Maintenance Process................................................................................... 9

Customer Order Process ..................................................................................................... 9

Delivery Process ................................................................................................................. 10

Report Generation ............................................................................................................. 11

6. DECISION TABLE ................................................Error! Bookmark not defined.

Decision Table for Profit Calculation .............................................................................. 12Decision Tree for Profit Calculation ................................................................................ 13

7. NORMALISATION ............................................................................................ 14

Owner Table ....................................................................................................................... 15

Car Table ............................................................................................................................ 15

Customer Table.................................................................................................................. 16

Order Table ........................................................................................................................ 16
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Acknowledgement

We would like to thank Prof Malathi Sriram for guiding us and for providing encouragement

and much needed moral support.

We are thankful to her for assigning us such an interesting project with a lot of learning involved

in it. The development of this project has enabled us to understand the contents of this course in

a better way. The project has given us a practical experience, which will prove to be very

beneficial in our future corporate life.


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Executive Summary

This Project is about creating an Information System for a Car Re-sale Center : Truevalue.

The Centre will buy used cars from the owners, will repair and maintain them and then sell them

to customers who are willing to buy second-hand cars.

We have to study such an existing Information System, find out what are the flaws in that

system, and describe the improvements required in terms of automation. Also, we have to

describe and structure the functional requirements of a new system.

Although the business process tends to be the same in both the cases, the manual process has

certain disadvantages:

Manual records are very difficult to be maintained safe Manual records are subject to greater human error Business can see itself in fines and penalties if records are lost Manual records are easier to be falsified, modified, altered or vanished, as compared

to computerized records which become very safe when using passwords, firewalls,

and back-ups.

Having all such disadvantages, there is a need to develop and design the information system for

the same in order to ease down the tedious manual process.


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Overall Business Process

The overall Business Process consists of the following steps:


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The existing system is a manual system where entries are made in the process registers. The

company purchases old cars from the owner and makes entries in the purchase register. Once

this is done the cars are sent for checking and maintenance by the employees and an updated

entry is made in the car register. Simultaneously the potential customers enquire for the cars.

Such an enquiry is followed by the tedious task of searching for the car availability in various

registers. This is the biggest disadvantage which calls for a lot of manual work and time. Once a

suitable match is found, whether through the registers or through the manual search, the details

are then given to the customers. Again the negotiation process is carried out and the final order

is taken and updated in the order register. Lastly the delivery is made to the customer and the

final update is made in the car register and the order register.

Car Owner Purchase Process Checking &Maintenance

OwnerRegister

CarRegister

Delivery Process Order Process

CustomerRegister

OrderRegister

Customer

Request for

Details

Owner personalDetails

CarDetails

Status

Update

CarDetails

CustomerPersonal

DetailsStatus

UpdateStatus

Update

CarDelivery

Delivery

Details

Order

Details

Existing System DFD

Initiates


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New Information System

The new Information System will do away with the manual process and put in place an

automated system. The new system will have a database with separate tables for Car Owners,

Car Details, Customer details and Transaction Details.

The CAD and DFDs for the New Information System are shown below:

Computer Aided DesignComputer-aided design (CAD), also known as computer-aided design and drafting (CADD), is

the use ofcomputer technology for the process of design and design-documentation. Computer

Aided Drafting describes the process of drafting with a computer. CADD software, orenvironments, provides the user with input-tools for the purpose of streamlining design

processes; drafting, documentation, and manufacturing processes. CADD output is often in the

form of electronic files for print or machining operations.

Car Owner Customer

TRUEVALUE

Manager

Sells car Enquiresabout Cars

GeneratesReports

Context Analysis Diagram

Purchases car
http://en.wikipedia.org/wiki/Computerhttp://en.wikipedia.org/wiki/Computer


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DataFlow Diagrams (DFDs)

A data flow diagram (DFD) is a graphical representation of the "flow" of data through an

information system. DFDs can also be used for the visualization of data processing (structured

design).On a DFD, data items flow from an external data source or an internal data store to aninternal data store or an external data sink, via an internal process.

The owner of the car would first enquire about the company and the sale process of the

company. As soon as the manager comes to know that there is a prospective seller, there is a

negotiation process between the company and the seller. In this stage the negotiation is done on

factors such as price and mode of payment. After this stage, the purchase process is carried out,

where the owner details are updated in the owner database. The transaction and payment process

succeed this stage. Once the entire process is carried out the car database is updated.

Car owner

Manager

Enquiry Process Negotiation Process

Purchase Process

OwnerDatabase

Car Database Payment Process

Details

FinalPrice

Date of PurchasePrice & Car Details

Owner & CarCar

Details

Transaction

Details

OwnerDetails

Initiates

Purchase Process

Car Details

Car Details


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This stage is an intermediate stage where the manager checks the car details in the car database

using the car details. He checks the current status of the particular car, if the car is ready to be

sold or needs maintenance and assigns tasks to his employees accordingly.

Next is the customer order process, any potential customer enquires about the availability of the

cars with the company. This information can be acquired from the car database. Similar to thepurchase process, the next stage is the negotiation process with the manger where a mutually

CustomerEnquiry Process Negotiation

Process

Manager

Order ProcessCar Database

Payment Process

CustomerDatabase

OrderDatabase

Seeks

Information

CarDetails Car

Details

Final

Price

Car

Details

Customer

Details

Transaction

DetailsCar Status

CustomerDetails,Price

Initiates

Customer Order Process

Manager Checking &Maintenance

Car Database

Car details

Car Status

Initiates

Checking and Maintenance Process


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agreeable price is fixed. The agreeable price of the car is based on the profit margin calculated

through the decision table (explained below). Once the final price is decided the details of the

customer are entered in the customer database. Customer details are also forwarded for the

payment process to be carried out. Once the payment is made the transaction details are updated

in the order database. After the entire process is completed the status of the particular car is

updated in the car database, i.e. from R(ready) to S(sold). The final updating to D deliveredis made only after the car is delivered to the customer.

In this stage, the employee checks the current status of the car from the car database and also the

proposed delivery date from the order database. If not delivered the employee checks with the

customer (gets the customer details from the customer database) and delivers the car. Once the

car is delivered the order database is updated to the actual date of delivery. The car status is alsoupdated from the S (sold) to D (delivered).

EmployeeDelivery Check Check with

Customer

Delivery

Car DatabaseCustomer

Database

OrderDatabase

Car ID Status

Detailsof Order

Delivery

Details

Customer ID

Customer IDCustomerDetails

Status Update

Customer Details

Initiates

Delivery Process


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Since the job of the manager is to make sure that all the processes are running smoothly, he can

seek information of any process at any given time through the query process. All the databases

(Order, owner, customer, and car) can generate reports for the manager as and when required.

Report Generation

Manager

Enquiry aboutCustomers

CustomerDatabase

Enquiry aboutCars

Car Database

OrderDatabase

OwnerDatabase

Order EnquiryEnquiry about

Owners

ReportaboutCustomers

Seek CustomerInformation

Queryabout Customers

CustomerDetails

SeekOrderInformation

QueryaboutOrders

OrderDetails

ReportaboutOrders

SeekOwnerInformation

QueryaboutOwners

Owner

Details

ReportsaboutOwners

Seek CarInformation Report

about Cars

QueryaboutCars

CarDetails


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Decision Table

Decision tables are a precise yet compact way to model complicated logic. Decision tables, like

flowcharts and if-then-else and switch-case statements, associate conditions with actions to

perform, but in many cases do so in a more elegant way.

Decision Table for Profit Calculation

Model >= 2006 Y N N Y N N

2000 < Model


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Model>=2006?

No

Yes

2000


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An entity-relationship (ER) diagram is a specialized graphic that illustrates the interrelationships

between entities in a database. ER diagrams often use symbols to represent three different types

of information. Boxes are commonly used to represent entities. Diamonds are normally used to

represent relationships and ovals are used to represent attributes.

In this ER diagram we have five basic entities namely Manager, Employee, Owner, Customer,

Car.

All these entities are inter- related The owner sells the car. One owner can sell many cars but a car can have only one

owner.

The manager purchases car from the owner. A Manager can purchase from manyowners but there is only one Manager.

A Customer can buy many cars but a car can have only one customer. The manager sells to the customer. One manager can sell to many customers but there is

only one manger.

A Manager manages many employees but an employee has only one manager. An employee delivers to the customer. One employee caters to many customers but a

customer is handled by only one employee.

An employee checks and maintains a car. Here a many-to-many relation is established,many cars are maintained by many employees.

Customer Deliver

Buys Car

Employee Owner

Checks

Sells

Manages

PurchasesFromManager

Sells to

Pur_Dt MakeModel

Address

Name

Car Id

Address

Name

Ph_No

Ma_IdName

Ph_No

Name

Emp_Id

Ph_No

Ow_ID

Status

Car

ID

Cus_ID Ow_Id

Entity Relationship Diagram


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Normalization

Normalization is the process of taking data from a problem and reducing it to a set of

relations while ensuring data integrity and eliminating data redundancy

Data integrity - all of the data in the database are consistent, and satisfy all integrityconstraints.

Data redundancyif data in the database can be found in two different locations (directredundancy) or if data can be calculated from other data items (indirect redundancy) then

the data is said to contain redundancy.

Owner Table

Owner ID Owner Name Address Contact Number

Pimary key : Owner ID

Car Table

Car ID Owner

ID

Make Model Owner

Number

Last

PurchaseDate by

Owner

Initial

PurchaseDate

Purchase

Price

Status*

*status: UM: Under maintenance, R: Ready, S: Sold, D: Delivered;Pimary key : Car ID, Foreign key: Owner ID


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Customer Table

Customer Id Customer name Address Contact Number

Primary key: Customer ID

Order Table

Customer ID Car ID Date of

Selling

Selling

Price

Date of

Delivery(proposed)

Date of

Delivery(actual)

-thank you

Date post:	07-Apr-2018
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