What is the purpose of UML use case diagrams？

A、circumlateral

B、contralateral

C、ipsilateral

D、mediolateral

E、heteromeral

A、Quantitative

B、Quantified

C、Quality

D、Quantities

1. Develop an activity diagram based on the following narrative. Note any ambiguities or questions that you have as you develop the model. If you need to make assumptions, also note them. The purchasing department handles purchase requests from other departments in the company. People in the company who initiate the original purchase request are the “customers” of the purchasing department. A case worker within the purchasing department receives the request and monitors it until it is ordered and received. Case workers process requests for the purchase of products under $1,500, write a purchase order, and then send it to the approved vendor. Purchase requests over $1,500 must first be sent out for bid from the vendor that supplies the product. When the bids return, the case worker selects one bid and then writes a purchase order and sends it to the vendor.

2.(1)To what events must the ticket-processing system respond? List each event, the type of event, the resulting use case, and the actor(s). Think carefully about who the actors are. Does the officer directly enter the ticket into the system? Or does a state patrol clerk do it when the paper ticket is received from the officer? The existing system uses paper forms, so for now assume the state patrol clerk enters all of the information. A new system would use the same use cases, but opportunities for efficiency and accuracy would lead to changes in who the actors are. (2)Write a brief use case description for each use case. (3)Draw a use case diagram for the ticket-processing system assuming the actors are based on your answers in question 1 (the existing system as described).

A customer’s interaction with the system involves logging in, making withdrawal requests, deposit requests, and balance inquiry requests. If the customer logs in, there is a possibility (although rare) that the system will confiscate the card (for example, if the login is incorrect or if the bank determines that the customer’s balance is significantly under zero). Card confiscation involves triggering an alert, which will be received by the branch manager of the bank. If the customer does a balance inquiry, this of course causes the system to check the balance. Checking the balance is also done when the customer requests a withdrawal, since the system must verify that enough money is in his account. In principle, checking the balance is a function that may be performed to support many use cases throughout the system..

A、

B、

C、

D、