Tutorial 10 V2 (1)

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May 14, 2024

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Faculty of Engineering and IT School of Computer Science 31269 Business Requirements Modelling Week 11 State and Event Modelling with State Transition Diagrams (The topics covered from week 6 onwards are related to your assessment 4) Objectives 1. Understand and practice State and Event Modelling with State Transition Diagrams 2. Practice how to convert a System Sequence Diagram and Use Cases to a State Transition Diagram 3. Get started and practice State Transition Diagram for assignment 4 case study Tutorial Case Study ‘Bookish Bliss’ Case study The ‘Bookish Bliss’ is a book retailing company which is situated in a large urban area in Sydney. The company wants to specialise in supplying textbooks to students at local universities and colleges. This requires close liaison with the local universities and colleges, ability to respond quickly to student demand, and the ability to handle large numbers of special requests. Currently the bookstore has been using manual methods of controlling sales and inventories, but the number of volumes sold has increased to the point that staff are having to work long hours to keep up the current level of service. Bookly, the store’s owner, has contacted your project team to develop a computer system to reduce the demanding work loads of staff. During an interview with Bookly, she explains that the current purchasing manager has been reporting difficulties keeping track of stock levels. The purchasing manager says that customers will frequently special- order books that are not on the shelves. A few days later the customer will find the book on the shelves, buy it, and not inform the staff that they had a special-order request for that book. This leads to the situation of books remaining on the special sales shelf, waiting for the special-order customer to pick it up, while others, finding there are no books of this title on the shelf, either go elsewhere or place another special order. The result is overstocking, unsold books and unhappy customers. The manager also suggests that it is difficult to determine the numbers of books to order for a given subject because past records of sales are difficult to compile. Local universities and colleges supply the bookstores

with book lists for most subjects. Some subjects, of course, don't require textbooks while others seem to regularly miss the deadline for making a recommendation and are not included on the list. The purchasing manager uses these lists to order the required stock, but since ‘Bookish Bliss’ is not the only supplier of books in the area, the purchasing manager needs to estimate the appropriate number of each book to order. To do this he wants to have a report that details the number of books ordered for subjects in the past and the quantity sold. Regular orders are sent either by mail or FAX to the supplier. With special orders, the manager immediately contacts the supplier of the appropriate book by telephone, orders the book and gives the supplier the appropriate purchase order number. If the supplier has a FAX, the order is sent immediately otherwise it is mailed. Currently a monthly inventory of stock on hand is taken and the sales staff prepare a weekly report of shortages. The purchasing manager uses these reports as an aid in making purchasing decisions. When books or other goods are received from a supplier, the receiving clerk immediately checks goods received against the appropriate purchase order. If the order is filled, the purchase order is stamped closed and passed onto the accounting department. If the order is only partially completed, the amounts of each item received is recorded and attached to the purchase order. A notice of received goods is sent to accounting. After receiving the goods, they are placed into pricing. The pricing clerk looks up the price of each book on his book list and attaches price labels to the books and they are placed on the shelves under the appropriate subject heading if the book is on a subject list. Books not belonging to specific area are placed in the general sales area. If the book is part of a special order, it is given to the salesclerk with a copy of the special purchase request. The pricing clerk also handles orders by phone or mail that occur from time to time. For customers with previously arranged credit, the goods are immediately sent along with an invoice. Those customers that have not been allowed credit are told the value of their purchase (by mail or phone) and the goods are held for a reasonable length of time for the payment to arrive. The salesclerks are assigned to a cash register. They start their shift by picking up their cash tray from accounting and they return their tray at the end of the shift with a copy of the customer receipts for their shift. When a customer requests a book which is not in stock, a special-order form is completed and sent to purchasing. When the customer returns to pick up the special order, the clerk looks on the special-order shelf to see if it has arrived and a sale is made if it is there. If the book is not found, the customer is asked to check again soon (the clerk often checks to see if any are on sale in the general or subject areas). The accounts clerk handles Accounts Receivable and Payable. When invoices arrive, the accounts clerk reconciles them against the goods received. If all is OK a payment is made. If the invoice does not match the goods received, the clerk contacts receiving and/or the supplier to account for any

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