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| Do you always buying drinks using vending machine? |
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| How often do you use vending machine? |
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| How many often do you see vending machine around your surroundings? |
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| Do you find it very useful when you are using it? |
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| Do you have any difficulties when using the vending machine? |
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| Do you take longer time to figure out the button when choocing the drink? |
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| When you buy drink from the vending machine, did you know which part of buttton for choosing the drink? |
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| Do you know all the function and instructions of the button on the vending machine? |
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