PROJECT DEFINITION:

Students will develop a Function Oriented Design $($FOD$)$ and prepare a report for it$.$ The FOD will

be developed according to the given scenario below:

SCENARIO:

Function$-$Oriented Design:

$1$ Introduction

Increasingly supermarkets are introducing self$-$service checkouts. Your task is to develop a design for Easy Checkout,

a new self$-$service checkout system. You should follow a function$-$oriented design approach, i$.$e$.$ you should develop:

a data flow diagram

structure charts

Your design should focus on the processing of a single product. This will provide the foundation for the full design of

Easy Checkout. Details on the requirements that you are to work with are given below.

$2$ Informal Requirements for Easy Checkout

Using Easy Checkout, customers take responsibility for presenting products to an optical barcode reader. Once this

scanning process is complete for each product, the barcode is converted into the store's internal product

identification scheme. Customers place scanned products on a conveyor belt, which takes them to the packing area.

Note that the conveyor belt also provides a weighing capability, i$.$e$.$ the products are weighed in order to check that

they match up with the barcode on the product. Your main responsibility as a designer is the processing of products

the scanning and checking described above. In order to support these processes, Easy Checkout reads data from

the following sources: Stock control database: maintains data on the current stock levels within the store.

Barcode reader: provides barcodes from products as they are scanned by the customers.

Product database: maintains data on all products within the store. Indexed by barcodes, the database holds weight

and price information for each product.

Weight reader: provides the weight of a product as it passes along the Easy Checkout conveyor belt.

Once a product has been identified, i$.$e$.$ its barcode has been read, the product's expected weight $($product database$)$

is compared with its actual weight $($conveyor belt weight reader$).$ If the expected and actual weights match then the

price of the product is sent to the console $($output device$).$ Alternatively, if the weights do not match, then an error

message is sent to the console. In addition, if the product is successfully processed then the stock control database

is updated so that a replacement product can be ordered.