Several categories of control activities are identified in the chapter using the following framework:

A.	Authorization
B.	Performance reviews
C.	Information-processing controls
	C1. IT general controls
	C2. IT application controls
	C3. IT-dependent manual controls
D.	Physical controls
E.	Segregation of duties

Following are specific control procedures prescribed by Trusty Inc., a public company:

1.		The software application must match information from a vendors invoices with information from receiving and information from the purchase order before a check is issued.
2.		Two authorized signatures are required on every check for payment of purchases over $100,000.
3.		Each month the credit manager carefully reviews the computer-generated aged trial balance of accounts receivable to identify past-due balances and follows up for collection.
4.		A supervisor must approve overtime work.
5.		The software application assigns sequential numbers to sales invoices used in the billing system.
6.		The software application verifies the mathematical accuracy of each voucher and prints an exception report for items with mathematical errors.
7.		Employee payroll records are kept on an electronic file that can only be accessed by certain terminals and are password-protected.
8.		An accounting supervisor reviews journal entries periodically for reasonableness of account classifications.
9.		Two individuals open the mail and prepare a prelisting of checks received. Then the checks received from customers and related remittance advices are separated in the mailroom and subsequently processed by different individuals.
10.		All vouchers must be stamped paid on payment.
11.		On a quarterly basis, the controller reviews a software-generated comparison of warranty expenses and actual warranty claims.
12.		Computer programmers are not allowed in the computer room.
13.		The software application will not complete the processing of a batch when the accounts receivable control account does not match the total of the subsidiary ledgers.

1) Indicate the category of control activities applicable to each procedure using the framework above.

2) Identify an assertion to which each procedure pertains.