Sd Chapter 4

1. When we solve a problem, there are three steps we should follow. The first is to understand the problem, the second is to find a solution to the problem and the last is to test the solution. One of the methods we can use to understand the problem is to draw up a(n) IPO chart which lists the inputs required to produce the wanted outputs as well as the processes required.

2. The purpose of an IPO chart is to help understand the processes and data interactions within the system. An IPO chart is used to describe the data elements which will enter the system, the processes that will occur and the data elements that leave the system.

3. Input: Weight, $2
Processes: Conversion of weight into cost, $2 plus each kilogram or part
Output: Postage of the parcel.

4 A barcode is read and compared with a master file. The name of the item and the cost are displayed. Additionally, the transaction file is updated with this information. (For example, the item may be taken from the list of stock items held.)

5 The due date is input from the borrower’s file. If the date is more than 14 days ago, a fine of 50 cents is levied and the borrower is stopped from borrowing any more books.

7. Input: Hours worked, rate of pay
Processes: Calculate pay via hours of worked times rate of pay
Output: Gross pay.