Boston Bottle

(BB) buys and sells a variety of glass and plastic bottles nationwide. Each

type of BB inventory has a unique item #. An individual sale or purchase can consist of

multiple inventory types which are each listed as a line item on the sale invoice or the

purchase order. Data about inventory items are added to the database when a supplying

vendor can be found for the new item who will provide a quoted price to BB. Vendors

can supply many products and vice-versa.

Customers are not assigned to any particular salesperson; anyone can service them. The

same is true for vendors and buyers. A sale, a purchase, or a cash transaction involves

just one BB employee. Customers and vendors are added to the database before any

transactions with them take place.

Cashiers handle cash receipts and disbursements, they are bonded, and they put all the

receipts from any one day into just one account, but these accounts vary daily. New cash

accounts are added to the database when they are opened. Employees are added to the database

on the day they are hired. Warehouses are added to the database before they are used.

All purchases are paid for immediately with a check drawn on a single account, but

multiple accounts are used in purchasing activity. All check numbers are different from each

other, even those from different accounts. Customers pay on the 25

th

of the

month for all sales during the previous month. Cash receipts and disbursements take

place within other cycles of BB.

Required:

Using the list of data elements on the following page (don't add or subtract any),

construct a UML class diagram with classes, associations, and participation multiplicities

specified

Please make an REA model with multiplicities please I do not understand.