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  • So, you want to know the difference between validity and reliability? Okay.....
  • Let's suppose you want to buy an item from this store. The clerk would use a scanner to determine the price of the item because it is the appropriate instrument to determine the cost. They wouldn't use a hairbrush to determine the cost, would they?
  • You could say that the instrument used to measure or determine the cost of the item is a 'valid' instrument to use for this task. In other words, the scanner does what it is designed to do.
  • So, the scanner may be the correct instrument to use for finding the price, but can I count on it to give me the correct price each time?
  • What if several clerks scan the item, on the same scanner, and got the same price? Well, I could say the scanner is reliable, in that it gives consistent results.
  • That's the difference between validity and reliability.
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