A supermarket has a system that allows customers to check out their own shopping. Identify and describe the purpose of two input devices and one output device used in this system. Input device 1 Purpose Input device 2 Purpose Output device 1 Purpose

Mark scheme

Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.

1. [6] 1 mark for appropriate device name and 1 further mark for appropriate purpose. Input devices Two from: ∞ Keypad / Keyboard ... e.g. to allow customer to input the quantity of an item ∞ Touchscreen ... e.g. to allow a customer to select a payment method ∞ Barcode scanner / Barcode reader ... e.g. to allow a customer to scan in their shopping ∞ Card reader // Cash deposit / intake ... e.g. to allow a customer to pay for their shopping ∞ Weighing scales ... e.g. to allow a customer to weigh fresh produce Output devices One from: ∞ Display / Touchscreen ... e.g. to allow a customer to see the running total of their shopping ∞ Speaker ... e.g. to give audio instructions to a customer about how to use the self-checkout ∞ Printer ... e.g. to print a receipt for the customer