• Reliability is synonymous with consistency.
  • A measurement that is unreliable is worthless.
  • Would “1 + 1 =  ” be a reliable question for basic math?
  • What about for history?
  • Intelligence?
  • If your bathroom scale showed the same weight every time you stepped on it, it would be a reliable measure of weight.
  • Imagine that every time you stepped on the scale it showed a different weight. Would you keep using this scale?