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1. A well designed information system should be able to check that input data is valid, but it can never ensure that information is accurate.
   1. Explain the distinction between accuracy of information and validity of data. Illustrate this distinction with a suitable example. (4)
      
   2. Describe two ways in which data capture errors may arise, together with techniques for preventing or reducing these errors. (4)
2. SupaGoods is a home sales company. Catalogues are left at people’s homes.  A local agent calls two days later to take orders and collect the catalogues.  The agent sends the details of the goods ordered to the Head Office where they are processed. The completed order is returned to the agent who distributes the goods and collects payment.
   1. Describe two distinct methods of data capture for the agent. State one advantage and one disadvantage of each method. (6)
      
   2. The orders are validated at Head Office
      1. Explain what is meant by validation. (2)
         
      2. Describe briefly two validation checks that might be carried out on an agent’s order. (4)
3. Most banks and building societies now offer cash withdrawal facilities through the use of Automatic Teller Machines (ATMs). The data that needs to be entered before a transaction can take place will include the customer's account number and Personal Identification Number (PIN).
   1. (i)  State three validation checks that should be made on the customer's account number. (3)
      (ii) State one validation check that should be made on the PIN. (1)
   2. These transactions will normally involve transmission of data from and to an ATM via a communications link. State one security precaution that should always be taken, giving a reason why it is needed. (2)
     

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