B
B.1
Barnaby Electronics Ltd - Creating
the Data Flow Diagram
Quotations and Orders Department - Current System
Description
The following text describes the day-to-day actions that take place in the case
study company called Barnaby Electronics Limited, in the Quotations and
Orders department.
Quotations and Orders Department
A customer may contact the department over the telephone or by fax or post.
If the customer is requesting a quote for an order, the Sales Administrator
will complete a Contact Sheet. The contact sheet contains the name and
address of the customer, along with the products the customer wishes to be
quoted for. Sometimes the customer knows the product number of the
products, especially if the customer has placed a regular orders previously,
but often, a description of the product required is all that is provided.
The contact sheet is then passed to the Purchasing department for them to fill
in the purchase price, expected delivery date and any missing product
numbers. The member of staff who completed the form must date the Contact
form before returning it to the Sales Administrator.
Once the completed Contact Sheet is returned to the Sales Administrator, a
quote is written, detailing the product number, description, quantity, price
and Expected Delivery Date for each product, total price and any special
requirements. The sales price on the quote is always 30% higher than the
purchase price provided on the contact sheet. The original quote is then sent
to the customer and a copy is placed on file. It is usually expected that a
customer request will be quoted within five working days
.
Appendix B
Barnaby Electronics Ltd
7
A customer must send an order in by post or fax, to provide a signature. An
order may be as detailed as it's quote or very brief indeed. Every order must
have been preceded by a quote, since product availability, prices and delivery
times vary from week to week. The original quote corresponding to the
customer's order must be found by searching through the quote file. If the
corresponding quote cannot be found, the order is returned to the customer.
Once the corresponding quote has been found, an order acknowledgement is
sent to the customer and the date on which the order was received is written
on the quote. The original Customer's order is then attached to the quote and
filed away. A photocopy of the order and the quote is passed on to the
Purchasing department who will process the order.
Although in most cases an order will list all the items listed on a quote, it is
possible that the products listed on a quote will be ordered in two or more
separate orders. In this case, the first order will be treated as any other order.
When the second and subsequent orders are received an order
acknowledgement is sent to the customer and the order is attached to the
quote and previous orders, and filed. A copy of the quote and most recent
order are then sent to the purchasing department and the quote is appended
to show the date most recent order was received.
Once all products on an order have been delivered to the customer, the
photocopy of the order and quote is passed back to the Sales Administrator
from the Purchasing department. The order copy will have the actual date of
delivery stamped on it. The Sales Administrator will write the Expected
Delivery Date on the original order and throw away the copy.
8
Mastering Database Design
Appendix B
B.2
Steps required to create a Data Flow Diagram
The following steps must be carried out to convert the text provided into a
Data Flow Diagram:
1. Draw a rough picture of your current system - showing the sequence of
events.
2. Identify the boundary of your system on your system picture
3. The boundary on your system picture will help to identify the External
Entities
4. Identify the Data Stores
5. Split the text into individual tasks
6. Build a Task table for each task, and split the task into smaller
instructions if possible.
7. Identify the Inputs to each instruction, and the source of those inputs.
8. Identify the Outputs from each instruction, and the destination of the
output.
9. Drawing Process Boxes and Data Flows on the Data Flow Diagram from
your Task tables.
B.3
Draw a Rough Picture of the Current System
In order to draw a picture of the current system, I have identified various
items: Customer, Sales Administrator, Contact Sheet, Purchasing, Quote,
Order and Order Acknowledgement. The drawing will show the sequence of
events that occur involving these items.
Appendix B
Barnaby Electronics Ltd
9
Purchasing
4.
Please send
me a quote
for 10
speakers type 157,
black, 12"
1.
Customer
Contact Sheet
Purchase Price,
Expected Delivery
Date,
Product No.
Authorisation Date
Completed
Order and
Quote Copies
Actual
Delivery Date
5.
16.
3.
17.
Contact Sheet
Customer name,
Address,
Product No and /or
description
Quantity
7.
Sales
Administrator
2.
6.
Quote
Product No. and
Description,
Quantity,
Sales price,
Delivery Date
Order and
Quote File
Copy
8.
10a.
14.
9.
Order
Product No.
Quantity,
Signature
Delivery Date
10b. Unmatched Order
(go back to step 2)
12.
Order
Acknowledgement
10 Mastering Database Design
14.
17.
13.
Matching
Quote Found
Date Order
Received
13.
Copy
Copy
15.
11.
Appendix B
B.4
Identify the Boundary of the System on the System Picture
To do this, the Terms of Reference must be referred to, in particular the Scope
of the New System section. This section is as follows:
The new system will only comprise those functions currently carried out by
the Quotations and Orders department.
The customer will continue to receive a quote on paper from the department,
as well as an order acknowledgement on paper, when an order is sent by the
customer. The customer's order will be retained within the system.
The Purchasing department will continue to receive a contact sheet listing
initial requirement details and will return the completed contact sheet. The
Purchasing department will also receive details of the order and the matching
quote for each new order as will return the completed order details as before.
It appears from this description that the only functions to be carried out by the
new system are those currently carried out by the Sales Administrator in the
system picture above. The Customer will not be part of out system, but will
still receive Quotations and Order Acknowledgements from our system, and
will send in Orders. the Purchasing department will also not be part f the
system. They will still receive Contact Forms and complete them before
returning them. They will also receive the copies of the Orders and Quotes to
carry out the Orders, and send the completed Order forms back as before.
The system boundary will be shown on the Systems Picture as follows:
Appendix B
Barnaby Electronics Ltd
11
Purchasing
4.
Please send
me a quote
for 10
speakers type 157,
black, 12"
1.
Customer
Contact Sheet
Purchase Price,
Expected Delivery
Date,
Product No.
Authorisation Date
Completed
Order and
Quote Copies
Actual
Delivery Date
5.
16.
3.
17.
Contact Sheet
Customer name,
Address,
Product No and /or
description
Quantity
7.
Sales
Administrator
Quote
Product No. and
Description,
Quantity,
Sales price,
Delivery Date
6.
Order and
Quote File
Copy
8.
10a.
14.
9.
Order
Product No.
Quantity,
Signature
Delivery Date
10b. Unmatched Order
(go back to step 2)
12.
2.
Order
Acknowledgement
14.
17.
13.
Matching
Quote Found
Date Order
Received
13.
Copy
Copy
15.
11.
System Boundary
12 Mastering Database Design
Appendix B
B.5
Identify the External Entities using the System Boundary
The System Picture above showing the System Boundary makes it easy to
identify the two External Entities relating to the System. An external entity
can be defined as a person, group of people or an automated object that sends
information to your system, or receives information from your system. A
group of people can be represented by a Company or a department for
example and an automated object could be a computer. In this case study, the
two external entities are the Customer and the Purchasing Department.
These external entities should be placed around the outside of your initial
Data Flow Diagram as follows:
Customer
B.6
Purchasing
Identify Data Stores from the System Picture
It is possible to identify the data stores from the text as well as from the
system picture - although it easier to identify them from the system picture. In
this case study, there appear to be three: Contact Sheet, Quote and Order. The
Quote and Order file is not actually a data store in it's own right, it is merely a
container for the Quotes and Orders. When a Quote or an Order is placed in
the File, the information is still on that Quote or Order, it has not been
transferred. Order Acknowledgement is really a Data Store, since it does not
Appendix B
Barnaby Electronics Ltd
13
contain any information in its own right, it is merely a copy of some
information from the Order sent back to the customer to let the Customer
know that the Order has been received.
The three data stores will be added (in pencil at first, since their position may
need to change once you add the processes) to the data Flow Diagram as
follows:
Customer
Purchasing
Contact Sheet
Quote
Order
B.7
Splitting the Text into Individual Tasks
When splitting the text up into individual tasks, it is worth considering the
following:
• Try to differentiate between text relating to information, such as the
details that are stored on the contact sheet, and the text relating to the
actions taking place, such as the contact sheet is passed to the purchasing
department. Split the text up by the actions.
•
Don't worry too much about the split. If you have inadvertently split up
an action that should have been kept as one, this will become apparent
when you fill in the Task table, and you will merge the two tasks back
into one again.
The text can be split into the following eight tasks:
1.
A customer may contact the department over the telephone or by fax
or post. If the customer is requesting a quote for an order, the Sales
14 Mastering Database Design
Appendix B
Administrator will complete a Contact Sheet. The contact sheet
contains the name, address of the customer, along with the products
the customer wishes to be quoted for. Sometimes the customer knows
the product number of the products, especially if the customer has
placed a regular orders previously, but often, a description of the
product required is all that is provided.
2.
The contact sheet is then passed to the Purchasing department for
them to fill in the purchase price, expected delivery date and any
missing product numbers. The member of staff who completed the
form must date the Contact form before returning it to the Sales
Administrator.
3.
Once the completed Contact Sheet is returned to the Sales
Administrator, a quote is written, detailing the product number,
description, quantity, price and Expected Delivery Date for each
product, total price and any special requirements. The sales price on
the quote is always 30% higher than the purchase price provided on
the contact sheet.
4.
The original quote is then sent to the customer and a copy is placed
on file. It is usually expected that a customer request will be quoted
within five working days.
5.
A customer must send an order in by post or fax, to provide a
signature. An order may be as detailed as it's quote or very brief
indeed. Every order must have been preceded by a quote, since
product availability, prices and delivery times vary from week to
week. The original quote corresponding to the customer's order must
be found by searching through the quote file. If the corresponding
quote cannot be found, the order is returned to the customer.
6.
Once the corresponding quote has been found, an order
acknowledgement is sent to the customer and the date on which the
order was received is written on the quote. The original Customer's
order is then attached to the quote and filed away. A photocopy of the
order and the quote is passed on to the Purchasing department who
will process the order.
7.
Although in most cases an order will list all the items listed on a
quote, it is possible that the products listed on a quote will be ordered
Appendix B
Barnaby Electronics Ltd
15
in two or more separate orders. In this case, the first order will be
treated as any other order. When the second and subsequent orders
are received, an order acknowledgement is sent to the customer, and
the order is attached to the quote and previous orders, and filed. A
copy of the quote and most recent order are then sent to the
purchasing department and the quote is appended to show the date
most recent order was received.
8.
Once all products on an order have been delivered to the customer,
the photocopy of the order and quote is passed back to the Sales
Administrator from the Purchasing department. The order copy will
have the actual date of delivery stamped on it. The Sales
Administrator will write the delivery date on the original order and
throw away the copy.
B.8
Build a Table for each Task, Split into smaller
Instructions and identify Inputs and Outputs
Although it appears that three of the steps required to carry out the data Flow
Diagram are being included here, it is important that the Inputs and Outputs
are identified at the time of splitting the tasks into smaller instructions (if
possible). If you go through the entire text, examining each task for smaller
instructions, write them in your tables, and the go back over the text to
identify the inputs and outputs, you need to familiarise yourself with each task
twice over. If you identify the Inputs and outputs the first time you examine
the tasks, you will save a lot of effort.
Each of the above ten tasks is examined and split up into smaller instructions
where possible. the Inputs and Outputs to each Tasks, or smaller Instructions
are then written in a Task Table as follows:
Instruction
Input
16 Mastering Database Design
Task n
from
Output
to
Appendix B
Task 1
A customer may contact the department over the telephone or by fax or post.
If the customer is requesting a quote for an order, the Sales Administrator
will complete a Contact Sheet. The contact sheet contains the name, address,
of the customer, along with the products the customer wishes to be quoted for.
Sometimes the customer knows the product number of the products, especially
if the customer has placed a regular orders previously, but often, a
description of the product required is all that is provided.
This can be split into two instructions:
1. Customer contacts Sales Administrator with a request for a quote
2. Sales Administrator fills in a Contact Sheet
The Inputs to the first instruction are the request details from the Customer.
There is no output for the first instruction.
There are not inputs to the second instruction, but the outputs are the details
written onto the Contact Sheet.
This is written in the Task tables as follows:
Appendix B
Barnaby Electronics Ltd
17
Instruction
Customer
contacts Sales
Administrator
with Quote
Request
Sales
Administrator
fills in Contact
Sheet
Input
Customer
Details,
Product No.,
Prod Desc.
Quantity
Task 1
from
Customer
Output
to
Customer
Details,
Product
No.,
Prod Desc.,
Quantity
Contact
Sheet
N.B. The Customer Name and Address have been abbreviated to "Customer
Details"):
Task 2
The contact sheet is then passed to the Purchasing department for them to fill
in the purchase price, expected delivery date and any missing product
numbers. The member of staff who completed the form must date the Contact
form before returning it to the Sales Administrator.
There appear to be two instructions here:
1. Pass Contact Sheet to Purchasing Department
2. Purchasing Department return Contact sheet to Sales Administrator
We must be very careful when the text provided describes functions that are
being carried out outside the boundary of the system. We are not interested in
the tasks carried out by the Purchasing Department, we are only interested in
the completed Contact Sheet that is returned to the system as an Input. It is
important to be aware of this especially when trying to decide whether a
document being transferred from one place to another is actually an Input or
Output to or from the system. In this case, the Sales Administrator is inside
the system boundary, and Purchasing is outside. So any document going from
Sales Administrator to Purchasing is an Output, and any document coming in
to the Sales Administrator from Purchasing is an Input to the system.
18 Mastering Database Design
Appendix B
Remember also, that when you write the Input and Output details in the Task
tables, you should only be writing down the details contained on the
documents, not the physical documents themselves. Therefore, in the first
instruction, although the output may, in real life, be the Contact Sheet, handed
to the Purchasing Department, the Output written on the Task table must list
the contents of the Contact Sheet and the to column will contain the external
entity Purchasing.
The same can be applied to the Input to the sales Administrator or the
contents of the Contact Sheet, being delivered from Purchasing for the
second instruction. the only difference here, it that the information listed in
the Input column for this instruction does not need to include all the
information on the Contact Sheet, since much of it was there before it was
sent to Purchasing. The only information that needs to be included in the Task
table, is that information that is newly added, such as the product Number (in
some cases), the Purchase price, Expected Delivery Date and Authorisation
date.
The task table for Task 2 will be as follows:
Instruction
Pass Contact
Sheet to
Purchasing
department
Input
Purchasing
return Contact
Sheet to Sales
Administrator
Product No.,
Purchase Price
Expected
Delivery Date,
Authorisation
Date
Task 2
from
Output
Customer
Details,
Product No.,
Prod Desc,
Quantity.
to
Purchasing
Purchasing
Although this task appears to obey the input/output rules - in that it has at
least one input and one output, the input and the output in this case should not
be tied into the same task. This is because they are not carried out as one
continuous action by the system (Sales Administrator). Although the Sales
Administrator sends out the Contact Sheet to Purchasing, there is no way to
determine when Purchasing will return the completed Contact Sheet. The best
way to incorporate these instructions into the system are to add them to other
Appendix B
Barnaby Electronics Ltd
19
appropriate tasks. The first instruction "Pass Contact Sheet to Purchasing
Department" could be the third instruction in the previous task, Task 1. This
would make sense, since the sales Administrator would receive the request
from the customer, fill n the Contact Sheet and then send it to Purchasing.
Task 1 will therefore become:
Instruction
Customer
contacts Sales
Administrator
with Quote
Request
Input
Customer
Details,
Product No.,
Prod Desc.,
Quantity
Sales
Administrator
fills in Contact
Sheet
Pass Contact
Sheet to
Purchasing
department
Task 1
from
Customer
Output
to
Customer
Details
Product No.,
Prod Desc.,
Quantity
Customer
Details,
Product No.,
Prod Desc.,
Quantity
Contact
Sheet
Purchasing
The second instruction in Task 2 would be more suitably included as first
instruction in Task 3, where the task refers to the once the completed contact
sheet is returned to the Sales Administrator. Task 2 therefore, no longer
exists.
20 Mastering Database Design
Appendix B
Task 3
Once the completed Contact Sheet is returned to the Sales Administrator, a
quote is written, detailing the product number, description, quantity, price
and Expected Delivery Date for each product, total price and any special
requirements. The sales price on the quote is always 30% higher than the
purchase price provided on the contact sheet.
There is just the one instruction here: writing the Quote. This instruction
appears to have only an output; the Quotation details being output to the
Quote data store. However, to write the Quote, the Sales Administrator
requires some information, in other words, some Input is required. This must
come from two sources; basic customer and product details from the Contact
Sheet, and the newly added information from Purchasing. This second input
will be provided from the second instruction from the now-defunct Task 2.
This instruction will be added as the first instruction. This task now has two
instructions, providing two inputs and one output.
The Task 3 table will be constructed as follows:
Instruction
Purchasing
return Contact
Sheet to Sales
Administrator
Write Quote
Appendix B
Input
Product No.,
Purchase Price
Expected
Delivery Date,
Authorisation
Date
Customer
Details,
product No.,
product
Description,
Quantity
Task 3
from
Purchasing
Contact
Sheet
Output
to
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price
Expected
Delivery Date
Quote
Barnaby Electronics Ltd
21
Task 4
The original quote is then sent to the customer and a copy is placed on file. It
is usually expected that a customer request will be quoted within five working
days.
This task appears to have two instructions only:
1.
2.
Send Quote to customer
Place copy of Quote in Quote file
The first instruction has an output of the Quote details being sent to the
Customer.
The second instruction however, needs some careful examination. In out data
Flow Diagram, the Quote is already considered to be a Data Store. In Task 3,
the second instruction output information to the Quote Data Store. In this
instruction however, no more information is being transferred, all is
happening is that the Quote Data Store is being placed into a container, the
Quote folder or filing cabinet. Since the second instruction is not a valid part
of the task, this leaves the task with only the first instruction:
Instruction
Send Quote to
Customer
Input
Task 4
from
Output
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price
Expected
Delivery Date
to
Customer
Since there is not Input to this task, this instruction will need to be added to
another task. the most appropriate task, would be the previous task, Task 3,
such that after the quote is written, it is then sent to the Customer. Task 3
will be re-written as follows:
22 Mastering Database Design
Appendix B
Instruction
Purchasing
return Contact
Sheet to Sales
Administrator
Write Quote
Input
Product No.,
Purchase Price
Expected
Delivery Date,
Authorisation
Date
Customer
Details,
product No.,
product
Description,
Quantity
Task 3
from
Purchasing
Contact
Sheet
Send Quote to
Customer
Output
to
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price
Expected
Delivery Date
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price,
Expected
Delivery Date
Quote
Customer
Task 5
A customer must send an order in by post or fax, to provide a signature. An
order may be as detailed as it's quote or very brief indeed. Every order must
have been preceded by a quote, since product availability, prices and delivery
times vary from week to week. The original quote corresponding to the
customer's order must be found by searching through the quote file. If the
corresponding quote cannot be found, the order is returned to the customer.
There are three instructions in this task:
1.
2.
3.
Receive Order from Customer
Find matching Quote
Return unmatched Order to Customer
Appendix B
Barnaby Electronics Ltd
23
The first instruction has Input only, that of the Order details from the
Customer. The second instruction has an Input also, the Quote details input
from the Quote Data Store that match the Order. The Third instruction has an
Output, the Order details being sent to the Customer. Remember again that the
task table is concerned with the physical way in which the information is
transferred.
The task table for Task 5 will be as follows:
Instruction
Receive Order
from
Customer
Find matching
Quote
Input
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price,
Expected
Delivery Date
Customer
Details,
Product No.,
Prod Desc,
Sales Price,
Expected
Delivery Date
Return
unmatched
Order to
Customer
24 Mastering Database Design
Task 5
from
Customer
Output
to
Customer
Details,
Product No.,
Prod Desc,
Sales Price,
Expected
Delivery Date
Customer
Quote
Appendix B
Task 6
Once the corresponding quote has been found, an order acknowledgement is
sent to the customer and the date on which the order was received is written
on the quote. The original Customer's order is then attached to the quote and
filed away. A photocopy of the order and the quote is passed on to the
Purchasing department who will process the order.
Although it sound like there is a lot going on, there are four instructions here:
1.
2.
3.
4.
Order Acknowledgement sent to Customer
The date the Order was received is written on the Quote
File the Order details
Order and Quote details sent to Purchasing
Many of the actions, such as the reference to the Customer's order being
attached to the quote and filed away are references to the physical documents
and where they are stored, as opposed to the information on those documents
actually being transferred from one document to another. Also, reference to
Order and Quote information being sent as photocopies is not relevant here.
However, so far we have not explained how the Order details are transferred
to the Order data store in our system. Other documents, such as the Contact
Sheet and the Quote are written as part of other tasks in the system, but the
Order is sent in by the Customer. We must therefore take this opportunity to
state that the order details are stored on the Order data store at this point.
Each of these four instructions has an output only; Order acknowledgement
details sent to Customer, Date order received written to the Quote Data Store,
and Quote and Order details sent to Purchasing. These actions are definitely
part of the same task, but there must be an input, to provide the information
that is being output to these three different sources. But where is the input
coming from? Imagine the Sales Administrator doing his work. In the
previous task, he found the matching Quote for the Order, and now he needs
to use the order and quote information to write the Order Acknowledgement,
update the quote and send the information to Purchasing.
Since the source of an Input can be either a Data Store, an External Entity or
another task, in this instance, the Input information is the matching Order and
Quote details transferred from the previous task, Task 5. This receipt of
information from the previous task need to be added to the task table as the
first instruction, an input.
Appendix B
Barnaby Electronics Ltd
25
Instruction
Receive
matching
Order and
Quote details
from Task 5
Input
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price,
Expected
Delivery Date
Send Order
Acknowledgement to
Customer
Write date
Order
received onto
Quote
File Order
details
Send Order
and Quote
details to
Purchasing
Task 6
from
Task 5
Output
to
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price,
Expected
Delivery Date
Date Order
Received
Customer
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price,
Expected
Delivery Date
Customer
Details,
Product No.,
Prod Desc,
Quantity,
Sales Price,
Expected
Delivery Date
Order
Quote
Purchasing
Task 7
26 Mastering Database Design
Appendix B
Although in most cases an order will list all the items listed on a quote, it is
possible that the products listed on a quote will be ordered in two or more
separate orders. In this case, the first order will be treated as any other order.
When the second and subsequent orders are received, an order
acknowledgement is sent to the customer, and the order is attached to the
quote and previous orders, and filed. A copy of the quote and most recent
order are then sent to the purchasing department and the quote is appended to
show the date most recent order was received.
This task appears to contain several new instructions. However, the previous
task, Task 6 has already defined how the information is transferred when a
matching quote is found for an order. Although this task is explaining what
happens when more than one order is place from one quote, if you ignore the
physical references to documents and photocopies, the three actions carried
out regarding the information are exactly the same:
1.
2.
3.
4.
Order Acknowledgement sent to Customer
Order is filed
Order and Quote details sent to Purchasing
The date the Order was received is written on the Quote
Since this task appears to be a repetition of the previous task, it will be
ignored in the Data Flow Diagram
Task 8
Once all products on an order have been delivered to the customer, the
photocopy of the order and quote is passed back to the Sales Administrator
from the Purchasing department. The order copy will have the actual date of
delivery stamped on it. The Sales Administrator will write the delivery date on
the original order and throw away the copy.
Remember that the reference to the products being delivered to the customer
is referring to a task that is outside the system boundary for this Data Flow
Diagram., as are references to physical documents and photocopies There are
therefore just two instructions here:
1.
2.
Actual Delivery Date of completed order returned from Purchasing
Write Actual Delivery Date on Order
Appendix B
Barnaby Electronics Ltd
27
The first instruction has one Input from Purchasing; Order details with Actual
Delivery date of completed order. The second instruction has one Output to
the Order Data Store; Actual Delivery Date.
The task table for Task 8 will be as follows:
Instruction
Receive
Actual
Delivery Date
of Completed
Order
Wrote Actual
Delivery on
Order
B.9
Input
Actual
Delivery Date
Task 8
from
Purchasing
Output
to
Actual
Delivery Date
Order
Draw the process Boxes and Data Flows on the Data
Flow Diagram
Of the original eight tasks, there are now five tasks: 1,3, 5, 6 and 8. Each of
these will be added to the Data Flow Diagram as a Process Box, each
numbered from 1 to 5. the Inputs and Outputs to each task will be shown as
Data Flows to and from the relevant Data Store, External Entity or Task.
Each of the five Process Boxes will be given a suitable name, to represent the
task:
Process Box 1
Process Box 2
Process Box 3
Process Box 4
Process Box 5
Receive and pass on Quote Request
Write Quote and send to Customer
Receive Order and locate matching Quote
Acknowledge matched Order
Receive completed Order
28 Mastering Database Design
Appendix B
Barnaby Electronics Limited - Quotations and Orders
Data Flow Diagram
Customer Details,
Product Details, Qty
1. Receive and
pass on Quote
Request
Customer Details,
Product Details, Qty
Customer Details,
Product Details, Qty
Customer Details,
Product Details, Qty
All Quote
Details
Customer
Customer Details,
Product Details,
Sales Price, Qty,
Exp Del Details
Quote
2. Write the Quote
and send to
Customer
Date Order
received
3. Receive Order
and Locate
Matched Order and
Quote Details
matching quote
Order Acknowledgement
Barnaby Electronics Ltd
4.Acknowledge
matched Order
Order detail
Order Acknowledgement
Appendix B
Ord
deta
Quote Details
Order Details
Returned Order
with no matching
Quote
Product No., Purch
Price, Exp Del Date,
Auth. Date
Contact Sheet
29